1182 EXPERIMENT STATION KECORD. 



is not (•(iiuplotely known at pn^st'iit, l>iit many aiMitional nl)S('rvationH uimim the si;l)- 

 ject arc iiiaile liy the authors. 



Tlu- ])n'vah'iic(' of tht> disease appears to depend largely upon the agency of biting 

 insects, and tin- authors lielieve that thin: js l)y far the niogt important mode of trans- 

 mission, or perhaps the only mode wliich requires consideration. Tlie question of 

 identity oi- nonidentity of surra, nagana, dnuriiie, and nial de caderas is considered 

 in (U'tail and tlie authors incline toward llie npiniMH that tiiese diseases are all one 

 and the same and should he referred U) l>y (lie term surra. 



The micro-org-anisms of pleuro-pneumonia and influenza in horses and the 

 treatment of these diseases, Z. F. Elenevkski (^-lrc7(. ]'el. Xauk, »SV. reterxbuvfj, 34 

 {1904), 'V((.s-. J, pp. 9S~U'>; .), })p. ..'()')-235, pin. 2). — An elaborate study was made of 

 the symptoms and etiology of these diseases with especial reference to the i)atho- 

 genic micro-organisms. The latter were cultivated o!i various nutrient media and 

 notes are given on their biological and morphological characters. 



The value of serum therapy was tested by means of numerous experiments. From 

 this study the author concludes that horses may be inoculated with the organisms 

 of contagious jileuro-pneumonia and influenza for the purpose of obtaining a preven- 

 tive and curative serum. The serum obtained from animals thus treated exercises 

 a preventive action in comparatively small doses and possesses pronounceil curative 

 properties. The curative action of this serum is considerably greater than that of 

 the ordinary pharmaceutical ^^reparations which are reconnnended for treating these 

 diseases in ordinary practice. The application of serum therapy in these diseases 

 brings about great improvement during the early stages. 



Bets in horses, S. S. C.'^meron {Jour. Agr. and Tnd. South Australia, 7 {1904), 

 No. 0, pp. 496-498) . — Brief descriptive, biological, and economic notes on this pest. 

 No satisfactory results are obtained from the administration of ordinary drugs for 

 expelling this parasite. The use of capsules of carbon bisulphid is recommended as 

 somewhat efficacious. 



Thymol, H. H. Cousins {Bnl. Dept. Agr. Jamaica, 2 {W04) , Xo. 3, pp. 57, 58).— 

 Thymol is recommended as the most satisfactory remedy for h)otflies in horses. It 

 may be dissolved in alcohol containing ten times its quantity of sugar. The mixture 

 is then heated so as to cause the alcohol to evaporate, thus leaving a uniform mixture 

 of thymol and sugar. This remedy may then be administered by mixing it with the 

 grain feed in doses of 15 grains twice per day for 2 days. 



Centrifug-alization and disintegration in relation to the virus of rabies, 

 J. 0. W. Barratt(0';j^W. Bald. u. Par., 1. Aht., Orig., 35 {1904), Xos. 5,pp. 633-640; 

 0, pp. 769-775, fig. 1).— The author made a study of the nature of rabies virus with 

 special reference to the effect of centrifugalization and disintegration upon it. It 

 ivas found that when the brain of a rabbit was disintegrated by the use of sand and 

 physiological salt solution the disintegrated material retained its virulence, as shown 

 by the inoculation of healthy rabbits. 



In another series of experiments a much more complete trituration was brought 

 aljout at the temperature of liquid air without the use of sand or salt solution. No 

 purely toxic effect was produced by the injection of an emulsion of centrifugalized 

 brain. When the disintegrated brain substance, however, was used for inoculation, 

 the toxic effet-ts appeared at first, l)ut were not noticeable during the second week. 



Note on the disintegration of rabid brain substance, J. O. W. Barratt 

 {Pruc. Roy. Soc. ILondoii], 73 {1903), No. 483, pp. 353, j5-^).— The author undertook 

 experiments for the purpose of determining whether the virus of rabies contains 

 organized bodies. To this end the brain of a rabbit Avhich had died of rallies was 

 disintegrated with sand at the temperature of liquid carbon dioxid and the disinte- 

 grated material was tested by the inoculation of healthy rabbits. 



As a result of these experiments it was found that the process of disintegration 

 when carried on for from one-half to one hour is usually sufficient to destroy the 



