alizarin-stained, cleared, whole or partially dissected embryos of the C 3 H 

 albino strain. The stages shown are at intervals of 1 day, from 14 to 38 days. 

 The skull and neck region, and the extremities are treated separately at higher 

 magnifications. In each stage only those ossification centres are specifically 

 indicated which appear for the first time. The atlas provides a dynamic and 

 integrated picture of the progress of ossification. A notable feature is the 

 attention paid to sex-differences in later stages. 



The atlas as such is preceded by a tabular survey of the chronology of 

 ossification, in which the centres are arranged alphabetically. A separate table 

 is devoted to the chronology of the sesamoid bones. The book is concluded by 

 tabular surveys of day-by-day mean body weights and weight ranges of C 3 H 

 embryos from 14 tot 40 days. 



"SYMPOSIUM ON MAMMALIAN GENETICS AND 

 REPRODUCTION" 

 1960 

 Edited by: Biology Division, The Wistar Inst, of Anat. and Biol. 



Oak Ridge National Laboratory Philadelphia 



193 pp., 34 figs., 42 tabs. 



This Supplement to vol. 56 of the "Journal of Cellular and Comparative 

 Physiology" contains the papers and open discussions of a Symposium held in 

 Gatlinburg, Tenn., in April 1960, under the sponsorship of the Biology Divi- 

 sion of the Oak Ridge National Laboratory. The participants to the Sympo- 

 sium were almost exclusively American and English. There are 12 papers, 

 more than half of which are of special significance to mammalian embryol- 

 ogists. Among the subjects treated are: triploidy, morphology and function of 

 gametes, embryonic gametogenesis, general developmental genetics, and phe- 

 nogenetics of hair and pigment mutants. The volume contains a name index. 



Authors of papers: Austin (London), Braden (Prospect, Austr.). Brauch-Russell (Oak Ridge, 

 Tenn.), Chase (Providence, R.I.), Falconer (Edinburgh), Gluecksohn-Waelsch (New York), 

 Griffen (Bar Harbor, Maine), Gruneberg (London), Hollander (Ames, Iowa), Mann (Pro- 

 vidence, R.I.), Mintz (Chicago, 111.), Owen (Pasadena, Calif.), Russell (Oak Ridge, Tenn.), 

 Wright (Madison, Wis.) 



286 



