390 EXPERIMENT STATION EECORD. 



is considered lilvely lliat tliis disease bears a close relation to that found in 

 Algerian dromedaries, wliicla is known to be transmitted by a species of 

 Atylotus or Tabanus. 



A brief account is given of trypanosomiasis of cattle and of mules. Up 

 to the present time the following forms of animal trypanosomiasis have been 

 found to exist in the Sudan : That of mules and horses, due to Trypanosoma 

 diniorplion or T. pccaudl, which also seems to effect cattle and camels in one 

 jirovince; that of camels, possibly due to T. soudancnse; that of cattle, due to 

 T. nannm; and that of cattle, due to a new trypanosome, probably either 

 T. cazalboui or T. hrticei. 



Atoxyl and its action, A. Breinl and M. Nierenstein {Ztsclir. Immunltdtsf, 

 11. E.vpt. Thcr., I, Orig., 1 {1909), pp. 620-632; abs. in Sleeping Sickness liur. 

 [London] Bui. 6, pp. 224-226). — The authors' conclusions are as follows: 



''Atoxyl unites in part with the serum proteids by means of the amido group. 

 The atoxyl-serum is oxidized and arsenic set free, with combustion of the 

 aromatic nucleus, both by means of oxidative ferments and also probably by 

 the trypanosomes themselves. At the same time a process of reduction goes 

 on by means of which the atoxyl is split up into arsenious acid and anilin and 

 the anilin is excreted with the feces. The arsenic set free, in part by oxidizing, 

 in part by reducing ferments, and also probably by the trypanosomes exercises 

 in the nascent state its destructive influence on the parasites." 



Poisoning' of stock with, arsenic, L. E. W. Bevan (Yet. Jour., 6-\ (1908), 

 7io. 401, pp. 5o7-559). — Many cases of poisoning are said to have occurred 

 among stoclt in Rhodesia during 1908. 



Arsenite of soda, which is supplied in large quantities by the government 

 for the eradication of locusts, is said to have been the form chiefly responsible 

 for the fatalities. Cattle grazing over sprayed areas are loath to leave on 

 account of the sweet or the brackish taste. The careless dipping or spraying 

 in arsenic-containing dips is another frequent source of poisoning. In order 

 to prevent drinking while in the dip, or the licking of each other while wet, 

 aloes has been added which renders the dip unpalatable. Poisoning also 

 results from absoi-ption when solutions are used which contain too great a 

 proportion of arsenic or when animals remain in the dipping tank too long. 

 The symptoms and jiost-mortem lesions are described. 



RURAL ENGINEERING. 



Report of the State engineer to the governor of South. Dakota for the 

 years 1907-8 {Bicn. Rpt. State Engln. S. Dak., 2 [1907-8), pp. 208, figs. 6). — 

 During the period 1907-8, the greater part of the work of the State engineer's 

 office was in administering the water code in regard to irrigation and water 

 power. This work has increased steadily with the agricultural and industrial 

 growth of the State. Attention has also been given to engineering features of 

 irrigation, drainage, and hydrography, all of which are reported upon. The 

 various private and public irrigation projects throughout the State are described, 

 and their progress noted, and the status of irrigation, and the water code and 

 its operation are discussed at some length. 



In the eastern part of the State a-large drainage project has been carried out 

 from plans and investigations made by the State engineer. This and other 

 drainage midertakings. which are stated to be rapidly increasing in number, are 

 described. 



The Wentworth. irrigation area, E. Harris (Agr. Gaz. N, S. Wales. 20 

 {1909), -Yo. 4, pp. 267-274, figs. 8). — This article gives the location, extent, and 



