A fur- ‘ - ther peculiarity of this type of colony is that theentire coenosarcal complex is covered externally by a common layer of ectoderm; it is not clear how this covering layer is developed.
41, F, G, H), and consists of the spadix bearing the gonads covered by a single layer of ectoderm (ex.), with or without the addition of an ectotheca.
Adding another layer of separation between past-Deidre and his mate settled some of his turmoil.
This layer he believes specially characteristic of arid dusty regions, while comparatively non-existent in moist climates or where foliage is luxuriant.
The metal is quite permanent in dry air, but in moist air it becomes coated with a superficial layer of the oxide; it burns on heating to redness, forming a brown coloured oxide; and is readily soluble in mineral acids with formation of the corresponding salts.
We can distinguish (I) digestive endoderm, in the stomach, often with special glandular elements; (2) circu-, latory endoderm, in the radial and ring canals; (3) supporting endoderm in the axes of the tentacles and in the endodermlamella; the latter is primitively a double layer of cells, produced by concrescence OC-- = w.?"
Thick, each layer being beaten firm, until the bed is 9 or io in.
Its width is as a rule about 24 ft.; at present its surface is formed of rough cobbling, upon which there was probably a gravel layer, now washed away.
For this reason the altar, as representative of the universe, is built in five layers, representing earth, air and heaven, and the intermediate regions; and in the centre of the altar-site, below the first layer, on a circular gold plate (the sun), a small golden man (purusha) is laid down with his face looking upwards.
The muscle-fibres arise as processes from the bases of the epithelial cells; such cells may individually become sub-epithelial in position, as in the polyp; or, in places where muscular tissue is greatly developed, as in the velum or sub-umbrella, the entire muscular epithelium may be thrown into folds in order to increase its surface, so that a deeper sub-epithelial muscular layer becomes separated completely from a more superficial bodyepithelium.
Metallic cobalt may be obtained by reduction of the oxide or chloride in a current of hydrogen at a red heat, or by heating the oxalate, under a layer of powdered glass.
The dark product obtained is washed with water, hydrochloric acid and hydrofluoric acid, and finally calcined again with the oxide or with borax, being protected from air during the operation by a layer of charcoal.
By strongly heating a mixture of boron trioxide and aluminium, protected from the air by a layer of charcoal, F.
She did not know and would not have believed it, but beneath the layer of slime that covered her soul and seemed to her impenetrable, delicate young shoots of grass were already sprouting, which taking root would so cover with their living verdure the grief that weighed her down that it would soon no longer be seen or noticed.
The Atlanta night was muggy and dark; a thin layer of smog trapped the city's light and made the sky glow an eerie yellow-orange.
4), in an early form, consisted of a cell of insulating material having at its bottom a flat-headed platinum screw G; on the top of G was a layer of carbon powder C, on the top of that a platinum disk D, and above that again, forming the cover of the cell, a disk of ivory B, held in position by a ring E.
The microphonic portion of the transmitter is contained in a thin cylindrical box or case of brass A, the inner curved surface of which is covered with an insulating layer of paper.
She grimaced when he peeled back the final layer of bandages to reveal the gouge and broken bones beneath.
The leaves quickly fell to the ground, forming a thick layer everywhere.
A layer of fine earth is then placed over the whole, and well beaten down, and the surface is covered with a thick coat of straw.
Beneath the epidermis is a longitudinal layer of muscle-fibres which are separated into four distinct groups by the dorsal, ventral and lateral areas; these are occupied by a continuation of the epidermic layer; in the lateral areas run two thin-walled tubes with clear contents, which unite in the anterior part of the body and open by a pore situated on the ventral surface usually about a quarter or a third of the body length from the anterior end.
The epithelial layer consists of (1) so-called " indifferent " cells secreting the perisarc or cuticle and modified to form glandular cells in places; for example, the adhesive cells in the foot.
The mesogloea in the hydropolyp is a thin elastic layer, in which may be lodged the muscular fibres and ganglion cells mentioned above, but which never contains any connective tissue or skeletogenous cells or any other kind of special mesogloeal corpuscles.
- This method of budding is commonly described as budding from a single body-layer, instead of from both layers.
B, The lower layer forms a solid G,H, Formation of the medusae.
Endoderm, containing the st, Stomach, which in H ac coelenteric cavity (cod), quires a secondary com while the outer layer munication with the diges furnishes the future ectotive cavity of the mother.
In the wall of the sack is a double layer of endoderm, the space between which is a continuation of the coelenteron.
U, Absorbing cell, with process (root-hair) from piliferous layer of root of Phanerogam.
The surface-layer of the body in the massive Fungi differs in character according, to its function, which is not constant throughout the class, as in the Algae, because of the very various conditions of life to which different Fungi are exposed.
It is kept covered, for purposes of preservation, by a layer of earth.
- A great part of the bottom of the Mediterranean is covered with blue muds, frequently with a yellow upper layer containing a considerable proportion of carbonate of lime, chiefly shells of pelagic Foraminifera.
F, Section through the surface tissue of the Brown Alga Cutleria multifida, showing the surface layer of assimilating cells densely packed with phaeoplasts.
In many Laminariaceae the thallus also grows regularly in thickness by division of its surface layer, adding to the subjacent permanent tissue and thus forming a secondary meristem.
Belonging primarily to the epithelial layer, the muscular cells may become secondarily sub-epithelial.
The sub-epithelial layer consists primarily of the so-called inter stitial cells, lodged between the narrowed basal portions of the epithelial cells.
The sub-epithelial layer thus primarily constituted may be recruited by immigration from without of other FIG.
In its fullest development, therefore, the sub-epithelial layer consists of four classes of cellelements.
Teredo navalis, it has been found necessary, for depths not exceeding 300 fathoms, to protect the core with a thin layer of brass tape.