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...y of pregnancy, section 11-4-4. (Reprinted with permission from Hertig and Rock. Contrib. Embryol. 31: 65-84, 1945.)

...ed and, in some places, it “runs along as a layer of mesothelium” (Heuser, Rock, and Hertig, 1945). The amniotic cavity may be either smaller or larger tha ...primitive streak, the endoderm consists of large vesicular cells (Heuser, Rock, and Hertig, 1945). It should be kept in mind that, in the chick embryo, it

...or in age of [an] embryo when it is considered the same as ovulatory age" (Rock and Hertig, 1942).

The rock is traversed by numerous joints running both in a and that at a former period the volcanic rock extended considerably further than at present over the beds which are seen

...has so far been recorded in this country. It was discovered by one of us (J.H.D.) during the course of a post-mortem examination of a woman, aged 28, wh ...rtig ova of which a preliminary account only has so far appeared (Hertig & Rock, 1939). Further, it corresponds with Streeter & Wislocki's (1938) stage II

...pinion of naturalists is correct, namely, that all have descended from the rock-pigeon (Columba livia), including under this term several geographical race ...one has ever become wild or feral, though the dovecot-pigeon, which is the rock-pigeon in a very slightly altered state, has become feral in several places

...d connecting it to the duct. A similar appearance was described by Heuser, Rock & Hertig (1945) in embryo no. 7801, in which a cytoplasmic strand connects

...itutes the early phase of yolk-sac formation. In the opinion of Hertig and Rock it does not although Lewis (9) intimates that embryos of this age should ha These specimens have previously been described by Hertig and Rock (8). In the eleven day stage the membrane is well developed and sharply del

J.D. Boyd Anatomy Department, University of Cambridge ...re the investigations of Hertig and Rock since 1941 (summarized by Hertig, Rock & Adams, 1956). To a lesser extent, a number of other investigators have al

Finalism as a Rock of Offence

...ology History - Arthur Hertig#John Rock|alt=John Charles Rock|John Charles Rock (1890-1984)]] ...g|Arthur T . Hertig]], [[Embryology History - Arthur Hertig#John Rock|John Rock]] and Eleanor C. Adams

HEUSER, C., J. ROCK AND A. HERTIG 1945 Two human embryos showing early stages of the definitive

# KEMP, N. E., and Is'rocK, N. L., J. Cell Biol., 1964, 23, 49A, abstract.

To estimate the age of the embryo, Dr. Vant has followed Rock and Hertig (8), who put the ovulation date on the 14th day preceding the on

White RF. [[Embryology History - Arthur Hertig|Hertig AT.]] Rock J. and Adams E. ...logy of these specimens. I-Iertig and Rock (1941, 1945, 1949a) and Heuser, Rock, and Hertig (1945) describe briefly 8 corpora lutea associated with early p

...frog, chick, and human. B, larval form of shark; E and F, larval forms of rock fish; I and J, larval forms of frog; N and O, larval forms of chick; R, lar

...nclosure within uterine endometrium. (Redrawn and modified from Hertig and Rock, 1941, Carnegie Contr. to Embryology, vol. 29.) (B) Extra-embryonic membran ...umably begins to implant about 7 to 8 days after fertilization (Hertig and Rock, '45 ) . In doing so that pole of the blastocyst which contains the develop

...east during the development of nestling down and juvenile feathers. Barred Rock melanophores produce barreo feather patterns in White Leghorn, New Hampshir ...rom each parent. That chromosome from the female parent will have a Barred Rock factor, whereas that from the male parent will not. The Fj cock, therefore,

...than the other end. In some cases, as that of eggs laid on bare ledges of rock, this conical shape has probably had a definite natural selection value, i

...between the males of many species to attract, by singing, the females. The rock-thrush of Guiana, birds of paradise, and some others, congregate, and succe