ANIMAL PRODUCTION. 1103 



The text of the Wyoming pure food law is quoted, existing conditions discussed, 

 and the results of a number of examinations, whicli were made in carrying out the 

 provisions of the law, are reported. 



Report on the examination of foods, drugs, and public water supplies, 

 R. O. Brooks [Trniton: Kdiriii Fitzgennji', 190S, pp. 30). — The ri-sults of the examina- 

 tions made at the chemical department of the New Jersey State Laboratory of Hygiene 

 of samples of chocolate, cocoa, coffee, flavoring extracts, honey, milk, maple and 

 otlier sirups, molasses, olive oil, spices and condiments, drugs, mineral waters, 

 potable waters, etc., are reported. A number of samples of meat and meat products, 

 butter, and grape juice were examined for added preservatives. None were found 

 in the butter, grape juice, and mince-meat examined. Boric acid was found in 1 

 sam})le of sausage meat, 2 of Hamburger steak, and 1 of potted ham. 



National association of State dairy and food departments {.Tour. Proc. 

 SiiiJi Ann. Conr. X(tt. Assoc. Stale Dairi/ and Food Depis., pp. '>04). — This volume 

 includes the proceedings of the sixth annual convention of the National Associa- 

 tion of the State Dairy and Food Departments held at Portland, Or3g., and a sum- 

 mary of the State pure food laws, court decisions, etc. The volume was compiled 

 by II. B. Meyers. 



The household food supply of the TJnited Kingdom, K. E. Turnbull ( Trans, 

 irighhiml a ml A<jr. Sor. Scotlnnd, .'>. ser., 15 [190.3), ]>p. 197- Ul). — A statistical article. 



Relations of population and food products in the TJnited States, J. H. Blod- 

 GETT [U. S. Dept. Af/r., Dirision of Statistics Bid. 34, PP- <^6). — A statistical article 

 treating of the most important food proilucts based largely, according to the author, 

 upon the Census reports from 1850 to 1900. Some of the causes of the increase or 

 decline observed in the pKoduction nr use of different materials are discussed as well 

 as other general matters. 



The food factor in education {Brilish Med. .Tour., 1903, No. 220.5, pip. 797-800).— 

 A discussion of the character of the diet furnished in schools in England and the 

 importance of adequate food for young and growing students. A number of examples 

 of school diets are given. 



Text-book of hygiene, M. Rubner [Lehrlnicli der ITygiene. Leipzig and Vienna: 

 Franz Deuticke, 1903, 7. ed., pp. XII +982, figs. 29.5). — In the new edition of this 

 important work the author states that new material has been added, especially the 

 results of investigations carried on since the last edition. The volume, which is 

 designed for the use of students of medicine, physicians, sanitary officials, etc., con- 

 tains chapters on food and condiments in addition to the other topics usually treated 

 of under the general subject of hygiene. 



ANIMAL PRODUCTION. 



Variation in animals and plants, H. ]\I. Verxox [Xew York: Henry IIoU li- Co., 

 1903, pp. IX ^ 41.'), figs. .j'O). — Tlie 3 general subjects discussed in this volume are 

 the facts of variation, the causes of variation, and the relation of variation to evolu- 

 tion. The following topics serve as titles to chapters under this threefold division of 

 the Ijook, viz.: -Measurements of variation; dimorphism and discontinuous variation; 

 correlated variations; blastogenic variations; laws of variation; effects of tempera- 

 ture, light, moisture, salinity, food, products of metabolism, and general conditions 

 of life on variation; action of natural selection on variations; and adaptive variations. 



The variation of animals is treated at greater length than that of plants. The 

 author states that the keynote of much of the recent work on variation is the recog- 

 nition of the fact that all problems in this field, in order to be studied effectively or 

 be solved in a satisfactory manner, must be formulated in mathematical terms. 

 It is no longer considered sufficient merely to state that a certain variation occurs to 



