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Department of Embryology, Carnegie Institution of Washington, Baltimore, Maryland ...ovulationem, leaving only five and one-half days‘ actual development of the embryo to birth. The rate of development is compared with Eutherian mammals.

site of a developing ovum. (From Carnegie Institution, No. C467.) coUiculi. (From Carnegie Institution, No. C713.)

...also taken into account, the ratio is still higher. It seems that the male embryo is not so strong as the female, or else less likely, from other causes, to BIBLIOGRAPHY 253

With few exceptions, the younger the stage of development of an embryo of a particular species ...hology does not appear to be concerned with the further development of the embryo,

...mparatively recent years three authors have been so fortunate as to obtain embryo monotremes, on the skull of which they have worked. Fig. 1. - ''Ornithorhynchus paradoxus''. Embryo delta. J. T. Wilson Coll. Ventral aspect of a model of the

...tilized by a sperm cell ; division into many cells and development into an embryo ; nourishment from the mother's blood during growth in the uterus, through ...uterus in such a way as to insure attachment and nourishment of the early embryo.

Bibliography. 253 ZONA PELLUCIDA IN TURTLE EGGS 253

action among the organs of the vertebrate embryo 231 organs within the embryo. The study of the growth influences of

the embryo of the mouse and rabbit is lower embryo, until the sprouting of the primary

Washington, D. C. Published by the Carnegie Institution of Washington Carnegie Institution Of Washington, Publication No. 142

WASHINGTON, D. C. Published by the Carnegie Institution of Washington 1911 Carnegie Institution of Washington, Publication No. 142

Published By The Carnegie Institution Op Washington Carnegie Institution Of Washington, Publication No. 142

embryo (Heuser and Streeter, 1941 ; Hertig embryo extract prepared from 19- to 20day-old guinea pig embryos (Blandau and

...to give a median sagittal view of the right half of the entire brain. The embryo, fixed preferably in Zenker's fluid, was held in a mass of cotton wet with ...were cleaned of all precipitation with a small brush and syringe. Next the embryo was taken from the alcohol and pinned down to a piece of cork and with narr

From the Department of Embryology, Carnegie Institution of Washington, in the cartilaginous capsule of the ear in the human embryo. Amer. Jour. Anat.,

mater in the human embryo. Seventeen figures 145 embryos without a circulation of the blood and in the normal embryo.

...presents the direction of the first outgrowth of the cochlear pouch of the embryo. As shown by Streeter ('07) for the human, this first growth of the cochlea and the acoustic and facial nerves in the human embryo. Am. Jour.

...r-activity on the morphological structure of the synapse. Fourteen figures 253 ...Whether or not the ganglion cells observed by Rubaschin ('03) in the chick embryo represent cells of the nervus terminalis is problematical. This writer desc

synapse. Fourteen figures 253 ...Whether or not the ganglion cells observed by Rubaschin ('03) in the chick embryo represent cells of the nervus terminalis is problematical. This writer desc

Corner, G. W. 1915 Corpus luteum of pregnancy as it is in swine. Carnegie ...ctomjr in relation to the secondary sex characters of some domestic birds. Carnegie Inst. Washington, 243.