Reproduction and Ontogeny of the Hydromedusae.
The individual is the product of sexual reproduction; a person is an individual of lower rank, which may be produced asexually.
The marble ciborium, a small reproduction of the splendid one in S.
These first unscientific ideas of a genesis of the permanent objects of nature took as their pattern the process of organic reproduction and development, and this, not only because these objects were regarded as personalities, but also because this particular mode of becoming would most impress these early observers.
Instruments such as the telautograph and telewriter are apparatus for transmitting a facsimile of handwriting inscribed on a paper at one end of a line, the reproduction being made automatically at the other end of the line at the same time that the message is being written.
- All known hydropolyps possess the power of reproduction by budding, and the buds produced may become either polyps or medusae.
Certain extremely aberrant Diptera, which, in consequence of the adoption of a parasitic mode of life, have undergone great structural modification, are further remarkable for their peculiar mode of reproduction, on account of which the families composing the group are often termed Pupipara.
Reproduction by budding also occurs.
In a letter to a friend at the Perkins Institution, dated May 17, 1889, she gives a reproduction from one of Hans Christian Andersen's stories, which I had read to her not long before.
As already stated, there occur in the Hydromedusae two distinct types of person, the polyp and the medusa; and either of them is capable of non-sexual reproduction by budding, a process which may lead to the formation of colonies, composed of more or fewer individuals combined and connected together.
It is in these parasitic forms that we meet with the method of reproduction by sporogony described above.
No specialized system of spermathecae, sperm reservoirs, and copulatory apparatus, as in Oligochaeta; development generally through a larval form; reproduction by budding also occurs.
Nevertheless, the function of reproduction is occasionally exercised by larvae.
The equable temperature of these cellars and their freedom from drought is one cause of their great success; to this must be added the natural virgin spawn, for by continually using spawn taken from mushroom-producing beds the potency for reproduction is weakened.
For very refined work, however, the irregularities in the reproduction of the reseau may be studied by comparing the measures of the original reseau with the mean of corresponding measures of a number of photographed copies of it.
Nearly every possible method of reproduction occurs amongst the Hydromedusae.
In this way we may distinguish, first, vegetative reproduction, the result of discontinuous growth of the tissues and cell-layers of the body as a whole, leading to (I) fission, (2) autotomy, or (3) vegetative budding; secondly, germinal reproduction, the result of the reproductive activity of the archaeocytes or germinal tissue.
Protohydra is a marine genus characterized by the absence of tentacles, by a great similarity to Hydra in histological structure, and by reproduction by transverse fission.
The sexual reproduction is unknown.
It may be that in particular cases particular modes of cultivation disfavour the host; or that the soil, climate or seasons do so; but overwhelming evidence exists to show that the principal causes of epidemics reside in circumstances which favor the spread, nutrition and reproduction of the pest, and the lesson to be learnt is, that precautions against the establishment of such favoring conditions must be sought.
Lxxvi.; Henneguy, Leons sur lacellule, morphologic et reproduction (Paris, 1896); 0.
Reproduction is mainly asexual, the females producing living young without the agency of a male.
I first tried to ascertain what had suggested to Helen's mind the particular fancies which made her story seem like a reproduction of one written by Miss Margaret Canby.
This method of reproduction has been described by E.
Those who believe the " Declaration " to be spurious argue that survivors remembered only one such document, that the Resolutions might easily be thought of as a declaration of independence, that Governor Martin in all probability had knowledge only of these and not of the alleged " Declaration," and that the dates of publication in the Raleigh and Charleston newspapers, and the politics of those papers, show that the Resolutions are authentic. In July 1905 there appeared in Collier's Weekly (New York) what purported to be a facsimile reproduction of a copy of the Cape Fear Mercury which was referred to by Governor Martin and which contained the " Declaration "; but this was proved a forgery.'
With certain rare exceptions the Saccharomycetes have three methods of asexual reproduction: I.
Operates in the line of the listening subscriber, causing the reproduction of the speech in the latter's receiver.
The non-sexua 1 reproduction takes the form of fission, budding or sporogony, the details of which are described below.
The casket was opened in 1906, at the instance of the emperor William II., and the draperies enclosing the body were temporarily removed to Berlin, with a view to the reproduction of similar cloth.
The writer claims to have treated his subject impartially, and though written from the narrow point of view of one to whom Monophysite "orthodoxy" was all-important, it is evidently a faithful reproduction of events as they occurred.
The most magnificent part of the exterior and indeed the finest polychrome monument in existence is the west façade, built of richlysculptured marble from the designs of Lorenzo Maitani of Siena, and divided into three gables with intervening pinnacles, closely resembling the front of Siena cathedral, of which it is a reproduction, with some improvements.
Melaniidae, but mantle-border not The freely projecting fringed and reproduction oviparous.
Liber magnus, vulgo "Liber Adami" appellatus, opus Mandaeorum summi ponderis (2 vols., Berlin and Leipzig, 1867), is an excellent metallographic reproduction of the Paris MS. A German soul, permeates the whole aether, the domain of Ayar.
Paired processes on the eighth and ninth abdominal segments may be specialized as external organs of reproduction, but these are probably not appendages.
The larvae produced by this remarkable method (paedogenesis) of virgin-reproduction are hatched within the parent larva, and in some cases escape by the rupture of its body.
The calendar was the Syro-Macedonian, a solar, as distinct from the primitive lunar, calendar, which Roman influence disseminated throughout Syria; it was practically a reproduction of the Julian calendar.
About the same time, in a letter to a friend, in which she makes mention of her Southern home, she gives so close a reproduction from a poem by one of her favourite authors that I will give extracts from Helen's letter and from the poem itself:
The term " telephony " was first used by Philipp Reis of Friedrichsdorf, in a lecture delivered before the Physical Society of Frankfort in 1861.1 But, although this lecture and Reis's subsequent work received considerable notice, little progress was made until the subject was taken up between 1874 and 1876 by Alexander Graham Bell, a native of Edinburgh, then resident in Boston, Mass., U.S.A. Bell, like Reis, employed electricity for the reproduction of sounds; but he attacked the problem in a totally different manner.
This conception of,the plant as an aggregate or colony of independent vital units governing the nutrition, growth and reproduction of the whole cannot, however, be maintained.
Harper, Sexual Reproduction and the Organization of the Nucleus in certain Mildews (pub.
Soon after its appearance in print I was pained to learn, through the Goodson Gazette, that a portion of the story (eight or nine passages) is either a reproduction or adaptation of Miss Margaret Canby's "Frost Fairies."
The only one of these possible modes of reproduction not known to occur in Hydromedusae is parthenogenesis.
The term Cryptogam is archaic, implying a hidden method of reproduction as compared with the obvious method represented by the flower of the Phanerogam; with the aid of a good microscope it is, however, easier to follow the process of fertilization.
Every plant is constrained to carry Out its functions of germination, growth, nutrition, reproduction, &c., between certain limits of temperature, and somewhere between the extremes of these limits each function finds ao optimum temperature at which the working of the living machinery is at its best, and, other things being equal, any great departure from this may induce pathological conditions; and many disasters are due to the failure to provide such suitable temperaturese.g.
Vii.; On the Structure and Reproduction of Cystopus candidus, Ann.
Asexual reproduction universal.
Presbyterianism in the United States is a reproduction and further development of Presbyterianism in Europe.
Occasionally the power of reproduction is thrown still farther back in the life-history, and it is found that from a single egg a large number of embryos may be formed.
Asexual reproduction only in Naids.
Reproduction, of the Al-Shifa'.