810 EXPERIMENT STATION RECORD. 



subject attention is given to tapeworms of the cat, dog, and horse, with especial refer- 

 ence to those forms which are of economic importance as parasites of man or impor- 

 tant domestic animals. 



The method of distribution of trichina embryos, C. Staubli ( Vrtljschr. 

 Naturf. Gesell. Zurich, 50 {1905), No. 1-2, pp. 163-176).— By means of feeding experi- 

 ments with mice, guinea pigs, and other experimental animals the author studied 

 the method of distribution of trichina embryos after hatching in the intestines. 



During these experiments infested muscle tissue from human beings, pigs, and rats 

 was used. When samples of the cardiac blood were taken for study, a number of 

 trichina embryos was found in every case in the blood, the number varying from 2 

 to 230 in the different samples. In order to demonstrate the trichina embryos most 

 easily it was found desirable to stain with acid eosin and methylene blue. Trichina 

 embryos were found in the blood within 7 days after the infested meat was eaten. 



The author's investigations on laboratory animals lead him to believe that the 

 young embryos are not carried through the vena portse, but through the thoracic 

 duct. This view of the subject of the distribution of trichina embryos makes it pos- 

 sible to understand more readily how they make their way so rapidly from the 

 intestines to various muscles of the body. 



An infectious pneumonia of rabbits and its treatment with antiserum, 

 H. J. Sudmersen {Centbl. Bakt. [etc.], 1. Abt., Orig.,38 {1905), Nos. 5, pp. 591-600; 

 6, pp. 713-732, figs. 2). — The investigations reported in this paper have been under 

 way for 3 or 4 years and were undertaken to discover the cause of an epidemic among 

 laboratory rabbits. 



Post-mortem examinations indicated that Bacillus A was present in the lungs of 68 

 per cent of all rabbits affected with the disease. The same bacillus was obtained in 

 pure cultures from the lungs of guinea pigs affected with pneumonia. Pneumonia 

 in rabbits is usually accompanied by a nasal discharge. It is probable that certain 

 forms of pneumonia may arise secondarily to other infections, but the majority of 

 infections are due to Bacillus A. In cultivating this organism a toxin is produced. 



It was found possible in the injection of attenuated cultures to protect rabbits 

 against subsequent infection. The immune serum produced in such rabbits showed 

 pronounced agglutinative and bactericidal properties. The use of the serum is very 

 effective in producing immunity, but the immunity is passive and not of long dura- 

 tion. 



Serum treatment for dog" distemper, A. H. Meis {Berlin. Tierdrztl.Wchnschr., 

 1905, No. 50, pp. 848, 849). — A test w r as made of Piorkowski's serum in the treatment 

 of dog distemper. No effect was produced by the use of this serum and the author 

 believes that it is useless to attempt the manufacture of protective sera so long as the 

 micro-organism of the disease is not definitely known. 



The study of mixtures of antirabies serum and fixed virus, P. Remlinger 

 {Compt. Rend. Soc. Biol. [Paris], 59 {1905), No. 37, pp. 658-660) .—The author found 

 that intracerebral injections of fixed virus and antirabies serum in rabbits were quite 

 without effect. The action of this mixture is pronounced, however, when inoculated 

 under the skin or in the peritoneum. The effect of the mixture is to produce a 

 pronounced resistance to rabies. 



The protection of dog's against rabies by mixtures of fixed virus and anti- 

 rabies serum, A. Marie {Compt. Rend. Soc. Biol. [Paris'], 59 {1905), No. 37, pp. 

 637-639). — The author found that when dogs were inoculated with a mixture con- 

 taining 3.5 cc. of antirabies serum and 2.5 cc. of fixed virus they were thereby ren- 

 dered immune to fatal doses of rabies virus. In other experiments the amount of 

 the mixture used varied from 10 to 60 cc, but in general it is recommended that the 

 mixture consist of J virus and f antirabies serum. By using this mixture it appears 



