NOTES AND LITERATURE. 
ZOÖLOGY. 
McMurrich’s Human Embryology.' — In 1902, Dr. McMurrich 
published an excellent handbook of human embryology, well adapted 
to the needs of students of medicine, and it is a matter of gratifica- 
tion to others than the author that its sales have been such as to 
demand a second edition. In the preparation of the new edition, 
the author has revised the whole, changing the wording here and 
there, replacing some cuts and adding two others, while in parts the 
text has been re-written so as to incorporate the results of later in- 
vestigations. Thus he has added Conklin's explanation of inversion 
of right and left sides; the account of the fate of the somatic layer 
of the myotome is changed, and with it in other parts modifications 
in the account of the derma, and in the idea of a segmentation in the 
skin. There is added an account of the chorionic vessels, and a 
statement as to the origin of the decidual cells; the account of the 
heart muscles has been changed, as has that of the histogenesis of 
striped muscle, and Minot's work on the sinusoids has been incor- 
porated in the text. i 
There are very considerable changes in the account of the arteries 
of the trunk and umbilicus; the section on the metanephros has 
been re-written, the account: of the lymph nodes has been changed, 
as has that of the relations of the corpus callosum and the fornix. 
There are also modifications in the statements regarding the endo- 
lymph ducts and the formation of the vitreous body. The most 
extensive and important changes, however, are in those parts which 
relate to the musculature of the limbs, where the author has revised 
the matter in the light of his own researches. 
Dr. McMurrich has embraced the opportunity to add slightly (24 
titles) to the bibliographies and to correct various typographical and 
other errors; but as Huxley wrote Foster (Zzfe, vol. 2, p. 65), we 
! McMurrich, J. Playfair. 77e Development of the Human Body. A manual 
of human embryology Philadelphia, P. Blakiston’s Son & Co., 1904. 2d ed., 
Svo, pp. xix + 17-539, 272 text figs. $3.00. 
got 
