The struggle for life, much vaunted, is here the struggle to give life, the struggle for death, for if they can live three days in search of the female they die as soon as the fecundation is accomplished.
From the male A, the great Male, and from the great Female B are born without any fecundation whatever, spontaneously, little males a and little females 6.
Fecundation by contact is very rare in fish, other than selacians.
All that one sees is that parthenogenesis is always transitory, and that after a number of virginal generations, normal fecundation always intervenes.
It has varied in social bees, parting from the relation of the couple, the aggression of the male, to end in the political and autocratic fecundation of a sole female by a sole male chosen among an hundred slave favourites.
Fecundation is in all cases, doubtless, merely a rejuvenation, thus considered it is uniform not only throughout the animal series, but throughout the vegetable.
The fact of fecundation may also be explained by supposing that during coition the posterior wall of the vagina supplied the place of the absent floor of the urethra, thus forming a complete canal.
These cases are analogous to those exceptionable cases in which, after extirpation of the ovaries, both menstruation and fecundation have still taken place.
The reality of some kind of fecundation in this circumstance, and the mode of the phenomena, if there is one, are for the present equally uncertain.
It remained to discover which were the female organs which underwent fecundation from the spermatia.
It is remarkable that amongst these fungi the tube projected by the antheridium effects fecundation only by contact.
H] De Bary has claimed for the oogonia in Cystopus and Peronospora a kind of fecundationwhich deserves mention here.
But when the fecundation has taken place at the end of the rutting period, the ovum has reached its highest degree of development, and, if effectively fecundated, it will become a male.
Other circumstances, also, which can in some cases be easily detected, may prove detrimental to fecundationand development.
When, on the contrary, the generative force excited in the mother by successful fecundation is weaker, the fecundated germ does not attain the masculine sex.
The distinction between male and female characteristics appears to be determined before the fecundation of the ovum.
The individual man needs only nine months for his complete development, from the fecundationof the ovum to the moment when he leaves the maternal womb.
On the ninth or tenth day after fecundation the frog emerges from the egg.
Fecundation results and conception ensues, the ovum then remaining attached to the walls of the Uterus, and in time develops into the foetus.
But wherever the actual contact of spermatozoon and ovum occurs, the blending of the elements is performed and fertilization, impregnation, or fecundation is accomplished.
Generation requires that a spermatozoön be brought into actual contact with a germ that fecundation may follow.
We may also very properly allude to the fact that there is greater aptitude to fecundation immediately before and soon after the menstrual periods than at other times.
In higher orders of animals, fecundation occurs internally, the conjunction of the sperm and germ cells requiring the conjugation of the male and female sexual organs.
That fecundation sometimes takes place from right to left and thus produces these abnormal variations.
Several different modes of reproducing are observed when fecundation occurs within the body, which vary according to the peculiarities and organization of the female.
In some of the vertebrates, impregnation does not require sexual congress; in other words, fecundationmay take place externally.
The variation of time may be thus accounted for: after insemination, a considerable interval elapses before fecundation takes place, and the passage of the fertilized germ from the ovary to the uterus is also liable to be retarded.
There can be no doubt that it is the contact of the spermatozoa with the ovum, and in the changes which occur as the immediate consequence of that contact, that the act of fecundation essentially consists.
It is essentially necessary for fecundation that the spermatozoa should come into actual contact with the ovum.
I was very earnest to learn what would become of them in the subsequent spring, whether they would resume laying, or if new fecundation would be necessary; and if they did lay, of what species the eggs would be.
Description of a hive invented by the author page 4 Swammerdam's opinion on the fecundation of bees 8 Sentiments of M.
I chose this opportunity for supplying them with a queen, whose fecundation had been retarded to the twenty-eighth day, and which laid none but the eggs of males.
It is a singular fact, that the females, whose fecundation has been retarded, sometimes lay the eggs of males in royal cells.
You will remember that he ascribes this circumstance to some unknown vice in the ovaries of the queen; but he was far from suspecting that retarded fecundation had been the cause of vitiation.
The problem becomes still more difficult by reflecting on the natural state of things, that is when fecundation has not been delayed.
Therefore I took two females still virgins, but capable of fecundation for above five days, and put one in a glass hive sufficiently populous; the other I put into a different hive of the same kind.
My evidence is demonstrative, for I can always prevent queens from laying the eggs of workers, by retarding their fecundation until the twenty-second or twenty-third day.
I now come to the particular object of this letter, the fecundation of the queen bee; and I shall, in a few words, examine the different opinions of naturalists on this singular problem.
This arises from the body of such queens being shorter than that of those whose fecundation has not been retarded.
Fecundation and fertilization are important terms to remember.
What we see in the process of fecundation is a foreshadowing of the future man and woman.
The process of fertilization or fecundation is also known as impregnation and conception.
In 1883, the Bordeaux legal tribunal declared that artificialfecundation was illegitimate, and a social danger.
Attempts have been made to effect artificial fecundation by various distinguished men, from John Hunter to Schwalbe, but it is nearly always very difficult to effect, and often impossible.
Under these circumstances, in order to secure the desired end, without departing from widely accepted rules of morality, the attempt is occasionally made to effect artificial fecundation by injecting the semen from a healthy male.
How far, if at all, it is often asked, should sexual intercourse be continued after fecundation has been clearly ascertained?
Reproduction by zoospores formed of the whole contents of a cell, with a crown of numerous cilia; resting spores formed in sporangial cells after fecundation by ciliated spermatozoids formed in antheridial cells.
Duhousset took particular notice of the artificial fecundation of the fig-tree, a curious operation totally unknown in France.
Neither is the vagina indispensable, for cases are cited of the contraction of this organ accompanied by the rectovaginal fistula, in which fecundation is effected, although the fecundating fluid had been confined to the rectum.
If we suppose the fecundation of the flowers of forest trees to be attended with a tenth only of this calorific power, they could not fail to exert an important influence on the warmth of the atmospheric strata in contact with them.
Byrd, Professor of Obstetrics in the Medical Department of Washington University of Baltimore, has asserted that he has 'every reason for believing that fecundation or impregnation is always an electrical phenomenon; .
Fecundation taking place while either parent has been in this state has produced idiots and epileptics.
Defn: A female insect producing eggs from which young are hatched, though there has been no fecundation by a male; a parthenogenetic insect.
These divisions are called 'maturation divisions,' and until they are accomplished fecundation is impossible.
If fecundation occurs, the result will be a development of two embryos at the same time.
Nature provides for thorough fecundationin these cases by placing the plants which bear the male and the female flowers near each other.
We may, we trust, be pardoned for remarking upon the artifices imagined to prevent fecundation that there is in them an immense danger, of incalculable limits.
The fact that fecundation would be impossible during pregnancy, and that during this period the female, normally, has no sexual desire, are other powerful arguments in favor of perfect continence at this time.
In some aquatic plants the flowers elevate themselves above the surface of water while the process of fecundation is effected; submerging themselves again immediately afterward.
The male of a species of South American fish gathers up the eggs after fecundation has taken place, and carries them in his mouth until they are hatched.
In rare cases, three or even four ova are matured at once, and by fecundation produce a corresponding number of embryos.
It is interesting to observe the different methods by which fecundation is effected, both in plants and animals, for this is a process common to both.
Fecundation of the female element can only take place about the time of periodical development in the female.
In this class of animals the process is almost wholly analogous to fecundation in those plants in which the male and female flowers are on different plants or different parts of the same plant.
The modes by which fecundationis effected in animals are still more various and wonderful than in plants.
The process of fecundation in hermaphrodite animals is very peculiar.
The occurrence of multiple pregnancies may be explained by the supposition that ova matured subsequent to the first fecundation are also fecundated.
Human hermaphrodites are usually so deformed that fecundation is not effected, which is a fortunate safeguard against the multiplication of such monstrosities.
The time between the deposit of the semen and fecundation varies according to circumstances.
The condition of sterility in man may arise either from a condition of the secretion which deprives it of its fecundating powers or it may spring from a malformation which prevents it reaching the point where fecundation takes place.
On the arrival of this period of rut, fecundation took place on a large scale, this being very easy, thanks to the promiscuity in which primitive man lived.
That the maximum of physiological sexual excitement should tend to appear earlier than the maximum of fecundation is a result that might be expected.
As sexual intercourse without fecundation is not approved by the Catholic Church, it thus became logically necessary to permit women to masturbate whenever the ejaculation of mucus had not occurred at or before coitus.
It was believed that ejaculation in the woman is as necessary to fecundation as ejaculation in the man.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "fecundation" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: conjugation; enrichment; impregnation; insemination
