862 EXPERIMENT STATION RECORD. 



The value of resistant or negative work in animal dynamics, J. Lef^vrk 

 iCuinpt. Roid. Acad. Hci. [Paris], I'l-l (W(iii). So. 20, pp- I0I-I6O). — The author 

 discusses resistant or negative work — that is. tlie work expended — for instance, 

 in walking downstairs as compared with positive work or that expended in 

 walking upstairs. According to his calcuhitions. this negative work is equal 

 to one-half of the corresponding positive work. 



Lessons on elementary hygiene and sanitation with special reference to 

 the Tropics, AV. J. Prout {London: Watcrlow tt Sons, IDOo, pp. 15!), Ulus.; 

 rer. in Brit. Med. Jour.. IflOG. No. 2.'i06. p. 322). — In this volume, which was 

 printed for the colony of Sierra Leone, water, fond, dwellings, and iiersonal sani- 

 tation are among the topics considered. 



The hygiene of the intestines, E. Metchnikoff ( /'cr. (Ii'n. Sci.. 11 (UXX;), 

 No. 20. pp. S9D-906). — The dangers which may result from the passage of bac- 

 teria through the intestinal Avails and from the presence of bacteria and para- 

 sites in the intestines are pointed out and the importance of sterile and clean 

 food insisted upon. Special reference is made to the dangers which may 

 attend the use of uncooked vegetables, fruit, oysters, and other food materials. 



Putrefactive fermentation in the intestine, R. Baum stark and L. Mohr 

 {Zt.<ichr. E.rpt. Path. u. Tlier., 3 {1006), No. 3. pp. 6'S7-(]90).— According to the 

 observations reported, putrefactive jirocesses, as shown by the excretion of 

 ethyl-sulphuric acid and indican, continue in fasting as long as hunger feces 

 are retained in the intestine. After the excretion of such feces no indican was 

 tound in the urine. This is an additional proof that indol foi-med in the in- 

 testine is the sole source of renal indican and that it is not formed by the cleav- 

 age of body protein during fasting. 



Estimating the specific gravity of feces, II. Strauss {Zenthl. Gcsani. 

 Pliiiaiol. II. Patli. Stoffircchscls. n. .«'r.. 2 (1907), No. 2. pp. -'i9-52). — A pyknome- 

 ter suitable for use in determining the specific gravity of feces is described and 

 the method of making such determinations outlined. 



ANIMAL PRODUCTION. 



Commercial feeding~stuffs {Die Fiittcrniittvl dcs Handcls. Berlin: Paul 

 Parcy, 1906. pp. ¥111 + 1191, pl,s. 29, fii/s. 133). — This volume comprises papers 

 by a number of authors summarizing available data on composition, digestibility, 

 adulteration, and related questions with reference to the principal commercial 

 feeding stuffs. These papers are rein-inted from Die . Landnyirtscliaftlirhen 

 yersuclis-Stationen for 1900 and later, and have been noted as they have ap- 

 jieared. The volume contains a preface by (>. Kellner and an index compiled 

 l)y M. P. Neumann. 



Commercial feeding stuffs, E. II. Jenkins and A. L. Winton {Connecticut 

 State Sta. lipt. 1906, pt. 3. pp. 169-218). — The feeding stuffs examined under 

 the State law included cotton-seed meal, cotton-seed feed, linseed meal, rape- 

 seed meal, entire wheat meal, wheat bran, wheat middling.s, mixed wheat 

 feed, maize meal, gluten feed, hominy feed, rye feed, ground oats, buckwheat 

 middlings, malt sprouts, gluten feed, dried distillers' grains, dried brewers' 

 grains, miscellaneous mixed and proprietary feeds, special poultry feeds, meat 

 scrap and ground bone, condimental cattle feed, corn silage, and corn for 

 ensiling. 



As a whole, the results show fewer discrepancies between guarantec^d and 

 actual composition than formerly, and the authors state there seems little evi- 

 dence of any desire on the part of the manufacturers to deceive the ])ublic 

 regarding the quality of feed. 



" There are, however, a good many feeds offered for sale . . . which could 



