Sieve Tubes.The sieve tubes consist of partially fused rows of cells, the transverse cr lateral walls being perforated by minute openings, through which the contents of the cells are connected with each other, and which after a certain time become closed by,the formation of callus on the sieve plates.
For her sake, he made an effort to behave, but he truly loved the openings she gave him.
The eyepiece slides into the tube cd, which screws into the brass ring ef, through two openings in which the oblong frame, containing the micrometer slides, passes.
The best form of open fireplace is the ventilating stove, in which fresh air is passed around the back and sides of the stove before being admitted through convenient openings into the room.
Deep. There are a few clear openings in the outer rampart which the reef presents to the ocean.
The temples on the east side of the Otolum are distinguished by tall narrow vaults, perforated by numerous square openings giving the appearance of coarse lattice work.
Besides the delta of the Po and the large marshy tracts which it forms, there exist on both sides of it extensive lagoons of salt water, generally separated from the Adriatic by narrow strips of sand or embankments, partly natural and partly artificial, but havin openings which admit the influx and efflux of the sea-water, and serve as ports for communication with the mainland.
It is occupied by the branches and offshoots of the mountain ranges which separate it from the great plain to the north, and send down their lateral ridges close to the water's edge, leaving only in places a few square miles of level plains at the mouths of the rivers and openings of the valleys.
The district is by no means devoid of fertility, the steep slopes facing the south enjoying so fine a climate as to render them very favorable for the growth of fruit trees, especially the olive, which is cultivated in terraces to a considerable height up the face of the mountains, while the openings of the valleys are generally occupied by towns or villages, some of which have become favorite winter resorts.
The mode of formation of the sieve plate is not certainly known; but from the fact that delicate connecting threads of protoplasm are present between the cells from their first development it is probable that it is a special case of the normal protoplasmic continuity, the sieve pores being produced by a secondary enla~gement of the minute openings through which these delicate strands pass.
Bearings; in each case are openings, closed by sliding tubes, for examination and lubrication.
There are a number of openings through the outer bank and several small towns or ports have been built upon it.
QUATREFOIL, in Gothic architecture, the piercing of tracery in a window or balustrade with small semicircular openings known as "foils"; the intersection of these foils is termed the cusp.
- Vertical section in a plane running right and left through the anterior part of the visceral hump of Patella to show the two renal organs and their openings into the pericardium.
There are thus two female openings, one for copulation, the other for oviposition, as well as a male opening.
Fertilization takes place as the egg is laid, the spermatozoa being ejected from the spermatheca of the female and making their way to the protoplasm of the egg through openings (rnicropyles) in its firm envelope.
The two external openings of the nephridia are situated sometimes more 2 towards the ventral, at other times more towards the dorsal side.
The line of the genital openings is usually dorsal to the lateral nerve.
A zoning law determines definitely the residential, industrial and commercial districts; 29 street widenings, openings and cut-offs were under construction in 1921.
It was an assessed tax on the rental value of the house, levied according to the number of windows and openings on houses having more than six windows and worth more than £5 per annum.
From these structural and palaeontological evidences, geologists suppose that the formation of the cave was carried on simultaneously with the excavation of the valley; that the small streams, flowing down the upper ramifications of the valley, entered the western opening of the cave, and traversing the fissures in the limestone, escaped by the lower openings in the chief valley; and that the rounded pebbles found in the shingle bed were carried in by these streams. It would be only at times of drought that the cave was frequented by animals, a theory which explains the small quantity of animal remains in the shingle.
The dressed ore is introduced through a "hopper" at the top, and exposed to a moderate oxidizing flame until a certain proportion of ore is oxidized, openings at the side enabling the workmen to stir up the ore so as to constantly renew the surface exposed to the air.
The first pair of foliaceous appendages in each animal is the genital operculum; beneath it are found the openings of the genital ducts.
Below the falls the river rushes through a rocky gorge, and openings in the cliffs to the water are rare.
These openings are usually the sandy beds of dried-up or intermittent affluents, such as the Bak, Ham, Houm, Aub (or Great Fish) rivers of Great Namaqualand.
The pipes are assorted into sizes by passing them through graduated openings in a grilled wire frame, and those of good colour are bleached by the fumes of sulphur.
As the sinking of shafts or the driving of narrow entries or drifts is expensive, and as the mineral extracted rarely pays more than a small fraction of the cost, it is usual to plan this exploratory work so that the openings made shall serve some useful purpose later.
Large pillars of mineral should be left for the protection of the main openings, whether these be shafts or adits.
As the mine is opened the deposit is subdivided into blocks of convenient size by parallel passages, which form later the main haulage roads, and by transverse openings for ventilation.
A mine, however, may be over-developed, which results in loss of interest on the capital unnecessarily locked up for years by excessive development, and involves additional cost for the maintenance of such openings until they are needed for active mining operations.
In any case whether natural or artificial means be employed, a mine can only be ventilated properly when it has at least two distinct openings to the surface, one an intake or " downcast," the other a chimney serving as an " upcast."
Two compartments of a shaft may be utilized for this purpose, but greater safety is ensured by two separate openings, as required by law in most mining countries.
If the two openings to the mine are at different levels the difference in weight of the inside and outside air due to difference in temperature causes a current, and in the winter months large volumes of air will be circulated through the mine from this cause alone.
A certain pressure of air is required to maintain circulation against the resistance, and for a given volume per minute the smaller and more irregular the mine openings the greater must be the pressure.
Floods must be provided with channels of sufficient size to carry them safely past the mine openings, and intercepting ditches should be excavated for this purpose, and dams and embankments constructed to divert the flood waters.
In many cases, however, it has been found necessary to reopen the mine through the fallen ground, and even to excavate openings through the solid mineral.
For the purpose of the removal of the glass, the cooler end of the furnace is provided with a number of suitable openings, provided with movable covers or shades.
The plate with the glass attached to it is inverted, and compressed air or steam is introduced through openings in the plate.
When the window openings were large, as was the case in basilicas and other public buildings, and even in houses, the pieces of glass were, doubtless, fixed in pierced slabs of marble or in frames of wood or bronze.
This, being folded and placed in its sheath, is attached by both ends to the head, so that the melted liquor runs into both openings at the same time.
I, A, and it will be seen that, in addition to the openings of the male A 9" FIG.
In its more complete form a still has in addition the following fittings: - The dome is provided with openings to admit (I) the axis of the stirring gear (in some stills the stirring gear rotates on a horizontal axis which traverses the side and not the head of the still), (2) the inlet and outlet tubes of a closed steam coil, (3) a tube reaching to nearly the bottom of the still to carry live steam, (4) a tube to carry a thermometer, (5) one or more manholes for charging purposes, (6) sight-holes through which the operation can be watched, and (7) a safety valve.
The body of the still is provided with one or more openings at different heights to serve for the discharge of the residue in the still, and sometimes with a glass gauge to record the quantity of matter in the still.
He has, indeed, described in graphic terms the greatest of the more superficial changes he underwent; how he had " carried into logical and ethical problems the maxims and postulates of physical knowledge," and had moved within the narrow lines drawn by the philosophical instructions of the class-room " interpreting human phenomena by the analogy of external nature "; how he served in willing captivity " the ` empirical ' and ` necessarian ' mode of thought," even though " shocked " by the dogmatism and acrid humours " of certain distinguished representatives "; 1 and how in a period of " second education " at Berlin, " mainly under the admirable guidance of Professor Trendelenburg," he experienced " a new intellectual birth" which " was essentially the gift of fresh conceptions, the unsealing of hidden openings of self-consciousness, with unmeasured corridors and sacred halls behind; and, once gained, was more or less available throughout the history of philosophy, and lifted the darkness from the pages of Kant and even Hegel."
The portal consists of three arched openings, above which are two stages of arcades, open to the light and supported on slender columns.
They may be characterized as very elongated reptiles without limbs (unless with tiny vestiges of posterior limbs), without eyelids and external ear openings, with the teeth anchylosed to the supporting bones, a bifid slender tongue which is telescoped into its basal half, and with a transverse vent.
These openings are small and provided with a valve interiorly, which is opened during respiration, and closed when the animal dives.
They are provided with lids, made either of lead or of wood lined with lead, which have openings to serve for the introduction of the alloy and acid, and a vent tube to lead off the vapours evolved during the operation.
The external openings in the male are armed with a pair of hollowed spines.
The numerous niches, generally containing sacrificial (?) tables, 2 are often approached by window-like openings hewn out of one of the flat slabs by which they are enclosed.
In the former, which is also known as " post and stall" or "bord and pillar " in the north of England, " pillar and stall " in South Wales, and " stoop and room " in Scotland, the field is divided into strips by numerous openings driven parallel to the main rise headings, called " bords " or " bord gates," which are again divided by cutting through them at intervals, so as to leave a series of pillars arranged chequer-wise over the entire area.
Billwiller introduced the idea of sucking air into the flame at or just below the burner tip, and at this juncture the Naphey or Dolan burner was introduced in America, the principle employed being to use two small and widely separated jets instead of the two openings of the union jet burner, and to make each a minute bunsen, the acetylene dragging in from the base of the nipple enough air to surround and protect it while burning from contact with the steatite.
On each side, behind the head, there is a row of seven branchial openings, through which the water is conveyed to and from the gills.
Immediately above this fixed plate, and almost in contact with it, is another of the same dimensions, and furnished with the same number, n, of openings similarly placed, but passing obliquely through in an opposite direction from those in the fixed plate, the one set being inclined to the left, the other to the right.
Two additional arms were therefore constructed, consisting of a north-east and north-west breakwater, leaving two openings, one Boo ft.
The shore piers carry cantilevers projecting one way over the river openings and the other way over a shore span where it is secured to an anchorage.
Further, personal and domestic relations with the ruling families abroad give openings in delicate cases for saying more, and saying it at once more gently and more efficaciously, than could be ventured in the formal correspondence and rude contacts of government.
Packets, attached as ovisacs or egg-strings to the genital openings, or enclosed in a dorsal marsupium, or deposited singly or occasionally in bundles.
Canu in 1892 proposed two groups, Monoporodelphya and Diporodelphya, the copulatory openings of the female being paired in the latter, unpaired in the former.
In 1892 he distinguished the former as those in which the first antennae of the male have both members modified for holding the female, and the genital openings of the female have a ventral position, sometimes in close proximity, sometimes strongly lateral; the latter as those in which the first antennae of the male are similar to those of the female, the function of holding her being transferred to the male maxillipeds, while the genital openings of the female are dorsal, though at times strongly lateral.
"What are those holes up there?" enquired the boy, pointing to some openings that appeared near the top of the dome.
With this he began walking in the air toward the high openings, and Dorothy and Zeb followed him.
Within the entrenchment stood ten guns that were being fired through openings in the earthwork.
One of its sides had fallen in, another was on fire, and bright flames issued from the openings of the windows and from under the roof.