5 8z 



THE QUARTERLY REVIEW OF BIOLOGY 



material and case histories. The impres- 

 sion one gets is that the aged poor are in 

 most respects probably not far from a 

 random sample of the aged; but the 

 material given does not allow one to form 

 a definite judgment. 



UNITED STATES CENSUS OF. AGRI- 

 CULTURE: 1915. Reports for States, with 

 Statistics for Counties and a Summary for the 

 United States. Part I. The Northern States. 

 Part II. The Southern States. Part III. The 

 Western States. 



Issued by United States Department of Com- 

 merce, Bureau of the Census. 



Government Printing Office 

 Washington 

 Parti, $1.75 5! x 9; x + 1318 

 Part II, $1.75 5 |x 9;x + I3i 8 

 Part III, $1.00 5! X9; x + 512. 



These volumes constitute an invaluable 

 reference source to the human biologist 

 interested in the population problem. On 

 this account we think it important to call 

 attention to them here. They give, more 

 completely than ever has been done before, 

 the raw data as to how one large nation is 

 fed. 



THE MEDICAL DEPARTMENT OF THE 

 UNITED STATES ARMY IN THE 

 WORLD WAR. Volume IX. Communi- 

 cable and Other Diseases. 

 Prepared under the direction of Maj. Gen. M. 

 W. Ireland, by Lieut. Col. Joseph F. Siler. 

 U. S. Government Printing Office 

 $2-.oo 6£ x 10; 62.8 Washington 



Excellent clinical, pathological, and 

 statistical summaries of the army exped- 

 ience with infectious disease during the 

 war. No large amount of original data is 

 given in a form to tempt further biometric 

 analysis. 



ZOOLOGY 



LES LARVES ET NYMPHES DES 

 DYTISCIDES, HYGROBIIDES ET HALI- 

 PLIDES. Encyclopedie Entomologique X. 

 By Henri Bertrand. Paul Lechevalier 



100 francs Paris 



6\ x 10; vi + 366 (paper) 

 At the present time there exist but two 

 general works concerning the systematic 

 study of the larvae of Hydrocant hares. 

 Schiodte in his classical De Metamorphosi 

 Eleutheratorum figured and described a few 

 aquatic larvae belonging to the groups 

 of Dytiscids, Hygrobiids and Haliplids 

 (1865-1883), and much later, in 1901, 

 Fr. Meimert published his Larvae Dytis- 

 cidarum treating only the larvae of the two 

 first groups (to which he added the curious 

 larvae of Amphitpa discovered by Hubbard 

 in 1893) but already including about fifty 

 forms. The author of the present work 

 has endeavored to fill this gap in the 

 literature by attempting a complete revi- 

 sion of all the known larvae and nymphae 

 of the above mentioned families. The 

 monograph is divided into four chapters. 

 The first and more important one discusses 

 larvae. The systematic study of the 

 larvae of each family is preceded by a 

 morphologic account stating the ter- 

 minology that has been chosen, and 

 designed to render the reading of the 

 diagnoses easy. The different divisions 

 from sub-families to genera and species are 

 defined successively. For every genus, 

 general generic characters are analyzed 

 each in turn, and then those peculiar to 

 every larval stage. As to species, every 

 stage is the object of a diagnosis; then 

 come particulars concerning the etiology, 

 and the origin of the stock used. Dichot- 

 omous tables accompany this chapter; 

 they have been devised for every known 

 genus in the larval state, and for a great 

 number of species of the Palaearctic region. 



