Embryology. 179 
gotten illustration of North American Sphingidee,” a copy of which was 
presented to Harvard College by Mr. Wm. Calverley, of Barnegat, 
N. J., in October, 1887. The work consists of twenty-seven 
quarto plates of figures of Sphingide, and one of Papilio culverleyi. 
Dr. Hagen gives a careful description of the work, with a table of 
contents of the plates. Asa copy was also given by Mr. Calverley 
to the Library of Cornell University, I am able to add a few facts 
of interest. 
EMBRYOLOGY? 
Hertwie’s* Trext-Book or HUMAN AND VERTEBRATE EM- 
BRYOLOGY.—This very valuable hand-book of vertebrate embry- 
ology has just been completed by the publication of the second part, 
and, to those who know German, it will be a most welcome contri- 
bution to this very important subject. 
Dr. Hertwig’s little treatise is published in ‘a convenient form, in 
* Proc. Ent. Soc. Phila., 1864, pl. X. 
* Edited by Prof. Jno. A. ta am Philadelphia. 
3? Lehrbuch der Entwickelungsgeschichte des Menschen und de 
r 
Wirbelthiere. Von Dr. Oscar Hertwig. Octavo, pp. viii, 507. Gustav 
Fischer, Jena, 1887-1888. 
