RURAL ENGINEERING. 775 



milk has gradually acquired the power of agglutinating the abortion bacterium 

 during this experiment one or both of the rear quarters have been the first to 

 show agglutination. This suggests contamination of the rear quarters by 

 genital discharges." 



Warble flies, S. Hadwen {Canada Dept. Agr., Health Anim. Branch Bui. 16 

 {1912), pp. 20, figs. 15). — The first part of this bulletin, relating to the economic 

 aspect of warble flies, is based upon a questionnaire in which 36 replies have 

 been abstracted and tabulated. This is followed by a brief account of the 

 biology of Hypoderma hovis (pp. 7-20), a report on the occurrence of which in 

 Canada has been previously noted (E. S. R., 29, p. 357). 



It is concluded that the annual loss to hides through warbles in Canada 

 amounts to between 25 and 30 per cent. The egg is laid close to the skin at the 

 base of the hair on the legs and is cemented on by the ovipositor. The first 

 larvae, which were found in the esophagus on August 15, were under 5 mm. in 

 length and were provided with minute spines on all segments. The author 

 recommends that cattle be housed during the heat of the day, and that the 

 grubs be squeezed out early in the season. 



A list of 21 references to the subject is included. 



A disease simulating beri-beri in pigs fed on rice meal, S. Hadwen 

 {Canada Expt. Farms Rpts. 1914, pp. 473-475). — The author reports upon a 

 noncontagious disease in pigs resembling beri-beri in man which developed dur- 

 ing the course of feeding experiments with rice meal. It is pointed out that 

 there was a variation in the toxic properties in different shipments of rice meal. 

 The author is inclined to the opinion that the disease was caused by a toxin, 

 since the pigs improved as soon as the meal was taken from the diet. 



What is hog cholera? K. Schekn and C. Stange {Ztschr. Infektionskrank. 

 u. Hyg. Haustiere, 16 {1915), No. 4. p. 309). — ^A polemic. In this connection, see 

 work previously noted by Hutyra and Joest (E. S. R., 33, p. 285). 



Two new cestode parasites of domestic fowl, K. J. Skrjabin {Ztschr. 

 Infektionskrank. u. Hyg. Haustiere, 15 {1914), No. 3-4, pp. 249-260, figs. 9).— A 

 new tapeworm parasite from the hen in Brazil is described as Davainea viginti- 

 vasns, the eighth of the genus recorded from this host, and one from the duck 

 {Amis Ijosehas domestica) in Italy as D. microcotyle, the second species of this 

 genus recorded from the duck. Lists are also given of the tapeworms recorded 

 up to the present time from the hen, turkey, pigeon, duck, goose, and swan, 



RURAL ENGINEERING. 



Computing run-off from rainfall and other physical data, A. F. Meyeb 

 {Proc. Amer. Soc. Civ. Engin., 41 {1915), No. 3, pp. 549-648, figs. 56).— This 

 paper points out the necessity of basing conclusions with respect to run-off or 

 stream flow on extended physical data. 



On the basis that run-off consists of the residual rainfall after all losses 

 have been deducted, methods of computing these losses are treated in detail, 

 taking up in their order losses due to evaporation from water surfaces, snow 

 and ice, evaporation from land areas, and transpiration of plants. In this con- 

 nection a number of curves and other data based largely on observations are 

 given. A summary statement of the author's method of computing run-off is 

 made and the method applied to 15 widely different watersheds. The main 

 features of this method are as follows : 



"I. Collection of physical data. — (A) Rainfall and temperature data for sta- 

 tions on and near the given watersheds from which monthly rainfall and 

 temperature for the watershed are estimated. Rates of excessive rainfall at 

 different reasons of the year as indicated by Weather Bureau observations at 



