...In many cases the apparent tumor is a blighted ovum which has failed todevelop, but has grafted itself on its more fortunate twin and from it hasdrawn its nourishment... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Sometimes a monstrosity is owing to the inclosure of one ovum in anotherwhile the latter is still but a soft mass of cells and can easily close around thefirst...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The size of its largest ovum (10 mm...
Emil K. Urban 「Birds from Coahuila, Mexico」
...31536, 31537, 32605, and 32604, respectively, and the size of the largest ovum (2 mm...
Emil K. Urban 「Birds from Coahuila, Mexico」
...(August 10), ♀, 40420, ovum in oviduct 27 mm...
Erwin E. Klaas 「Summer Birds From the Yucatan Peninsula」
...Fertilization: takes place when a spermatozoönenters through the micropyle of an ovum and unites with the cellnucleus: loosely applied like copulation or to itscompletion...
John. B. Smith 「Explanation of Terms Used in Entomology」
...The development of the mammal is much more difficult to follow,because here the embryo is not detached and enclosed in a large egg, but thetiny ovum remains in the womb until the growth is completed...
Ernst Haeckel 「The Evolution of Man」
...Among the many great services which Baer rendered to embryology, especiallyvertebrate embryology, we must not forget his discovery of the human ovum...
Ernst Haeckel 「The Evolution of Man」
...It cannot, like the ovum, beget endless generations of cells, ofwhich some will become skin-cells, others muscle-cells, and others againbone-cells...
Ernst Haeckel 「The Evolution of Man」
...9), we have our ovum (Figs...
Ernst Haeckel 「The Evolution of Man」
...13 E) this ovum also is very like that of the mammal (Fig...
Ernst Haeckel 「The Evolution of Man」
...When weexamine a very young ovum in the hen’s oviduct, wefind it to be a simple, small, naked, amœboid cell, just like the young ova ofother animals (Fig...
Ernst Haeckel 「The Evolution of Man」
...D the ovum of a trout; E the ovum of achicken; F a human ovum...
Ernst Haeckel 「The Evolution of Man」
...So the ovum remains asimple cell, however much yellow yelk it afterwards accumulates within itsprotoplasm...
Ernst Haeckel 「The Evolution of Man」
...All these gradually forming envelopes and processes are of no importancein the formation of the embryo; they serve merely for the protection of theoriginal simple ovum...
Ernst Haeckel 「The Evolution of Man」
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