1082 EXPERIMENT STATION RECORD, 



(lUOS), No. 2, pp. J78, ltd, figs. .'/). — A trypanosorue that corresixnuls in siz(^ 

 with Trypanosoitiu tlicilcri, and also has the long tlagellnni and acutely pointed 

 posterior extremity of that organism, has been taken from cattle at the cattle 

 depot at IIoiig-Kong. 



A peculiar form, of streptotrichosis among cattle, J. I). E. Holmes (Jour. 

 Trap. Vet. -S'ti., 3 (1908), No. 3, pp. 289-300, pis. J,, fujs. 5).— The anthor pre- 

 sents a report of a study made of a disease that api)eared among army trans- 

 ]>ort bullocks in Calcutta in 1907. The clinical features of the disease are said 

 to bear a resemblance to equine ei)izootic lymphangitis. 



Bedwater in England and its carriers, S. Stockman {Jour. Compar. J'aih. 

 and Thcr., 21 (1!)08), No. 3, pp. 22.')-232 ; Vet. Jour., C, (1908), No. J,OI, pp. 

 53S-5Ji8, charts /,; Vet. Rec, 21 {1908), No. 1067, pp. 391-/i01, charts 4).— This 

 paper is based upon 3 years' investigations of the disease in (Jreat Britain 

 in collaboration with J. McFadyean, a more complete report of which will 

 be published later. 



Contrary to reports previously published in the United Kingdom, the author 

 has found the disease to be inoculable in a way similar to the Texas fever 

 type. Only two species of ticks (Ixodes 7-icinus and HwmaphysaHs punctata) 

 have been met with in England on cattle and sheep. Each of these species 

 drops for both molts. I. ricinus has been found the most often in redwater 

 pastures. II. punclnta though much more restricted in its distribution than 

 /. ricinus is more common in the southeast of England and has been obtained 

 from redwater farms on which /. ricinus could not be found. 



The few experiments made with /. ricinus failed to show that infection 

 passes through the eggs to the seed ticks, f^our experiments made with H. 

 punctata in which larvte were engorged upon infected hosts and placed as 

 nymphs upon susceptible hosts all resulted negatively. Similar results were 

 obtained when the larvfe from an infected female were used. In both of 

 two experiments, however, in which nymphs that had engorged oia infected 

 hosts were placed as adults upon susceptible hosts, the disease was produced. 



The ditHculty in destroying the ticks is shown by the fact that the immature 

 stages require but .*> or 4 days to engorge and drop. This hai)it of droiiping 

 for the molts appears to be favorable, however, in that the ticks are not carried 

 far to infect new territory. The author does not consider the number of ticks 

 found on the animal to have any relation to the severity of the attack but 

 considers such to depend upon the virulence of the Piroi)Iasma. The greater 

 prevalence of the disease from INIay to August is said, to correspond to the 

 period in th6 year at which adults are most numei'ous. As a prevention of 

 the disease the author recommends that cattle be kept off infected pastures, 

 that such i)astures be well stocked with sheep, and that the .sheep be dii)])ed 

 or sprayed at intervals of 10 days, particularly during the season at which the 

 adult ticks are in evidence. This recommendation is based upon the fact 

 that 10 days or more are required for the female ticks to engorge. 



Investigations on the nature of hog cholera and methods for its control, 

 I'HLENiiuTii ET AL. (Arh. K. Gsndhtsamt., 21 (1908), No. 3, pp. .'i2.')-(ni; ahs. 

 in Ccnthl. Bakt. [etc.], 1. Aht., Rcf., .',1 (1908), No. U-16, p. Ji80; Bui In'<t. 

 Pasteur, 6 (1908), No. 12, p. 505; Rer. G{-n. Med. VcH., 12 (1908), No. 139-1. 'lO, 

 p. .'il'i). — The authors have investigated the disease in Germany and corrobo- 

 rated the results obtained by Dorset, Bolton, and McBryde of this Department, 

 and proved the identity of German " schweinepest '" with the English swine 

 fever and American hog cholera. The virus was found to pass through Berke- 

 feld, Pukall, and Heim filters. 



The disease can not be jiroducal by the injection of filtrates from cultures of 

 Bacillus suipestifer. or by filtrates of serum or organ extracts from healthy 



