480 EXPEKIMENT STATION EECOED. 



retained by the collodion membrane, while the undiluted toxin passed through 

 freely. When dilute cobra venom was filtered, all toxicity was lost, but on fil- 

 tering successive quantities through the same collodion membrane, the filtrate 

 gradually became toxic, until the fourth filtrate was practically of the same 

 strength as the control. This result is in accord with the work of Marbe," on the 

 successive filtration of agglutinins through collodion sacs, and also with the 

 gradual passage of complement through a Berkefeld filter, as shown by the 

 author.* and later found by Muir and Browning " working on the same subject. 



" Evidently filtration through collodion sacs, as through Berkefeld filters, is a 

 phenomenon of adsorption, the substances in solution passing through when 

 adsorption has reached a certain degree. Formed particles, however, if able 

 to pass through at all, would pass through more rapidly in the beginning of 

 filtration, and later, as the pores become clogged, they would be retained, 

 while the opposite would occur with soluble substances, which appear in the 

 filtrate only after adsorption has become more or less complete. 



" Thus, by changing the concentration, the quantity to be filtered, or the thick- 

 ness of the sac, results may be obtained varying from total retention to complete 

 passage of the active substances through the collodion membrane." 



The bacterial integrity of collodion sacs, C. A. Fullek {Jour. Infect. Dis- 

 eases, 7 {1910), A"o, 5, pp. 66.'i-Gllf, figs. 4). — The author states, as the result of 

 his work with Bacillus typhosus, B. coli, B. prodigiosus, B. pijocyanens, and the 

 bacteria of crude sewage or septic tank effluent, that collodion sacs made ac- 

 cording to Frost's method will retain their bacterial integrity for months. 



Poisonous and medical plants of Missouri, L. H. Pammel {Ann. Rpt. Mo. 

 Bd. Hort., 3 {1909), pp. 17-'i-193, pis. 26; Missouri Bd. Hort. Bui. lit [1910^, pp. 

 46, figs. 26). — ^A condensation of the publication previously noted (B. S. R., 

 24, p. 384). 



Forag'e poisoning' or cryptogamic poisoning; also called enzootic cerebri tis, 

 epizootic cerebro-spinal meningitis, leuco-encephalitis, etc., C. H. Stance 

 {Amer. Vet. Rev., 38 {1911), No. 4, pp. 473-.',88, figs. 24).— Two outbreaks of 

 this affection that came under the author's observation during the year are 

 reported. In the first outbreak, which was caused by the feeding of moldy 

 silage. 9 out of 11 animals died. In the second outbreak, which was among 

 animals fed on hay cut from an old swamp that had been plowed up and seeded, 

 3 out of 4 affected animals succumbed. Part of a report by R. E. Buchanan 

 (E. S. R., 23, p. 630) on the mold Monascus purpureus, thought to have been 

 responsible for the death of the 9 animals to which moldy silage was fed, is 

 reprinted. 



A brief account of chronic bacterial enteritis (Johne's disease), including 

 the report of a case that occured in Iowa, is appended to the paper. 



An organism simulating anthrax, F. S. H. Baldrey {Jour, Trop. Yet. Sci., 

 5 {1910), No. 4, pp. 580-583). — The author describes an organism which is sel- 

 dom sufficiently pathogenic to cause death by subcutaneous inoculation, but 

 which frequently induces a severe necrosis and a gangrenous condition at the 

 seat of inoculation which tends to spread and can be cured only with great 

 difliculty by surgical and antiseptic means. In some cases only a severe edema- 

 tous and inflammatory swelling or lymphangitis is induced. 



In regard to the identity of the causative agents of hog erysipelas, ery- 

 sipeloid, and mouse septicemia, Bickmann {Ztschr. Byg. u. Infektlonskrank., 

 64 {1910), No. 3, pp. 362-364; ahs. in Hgy. Rundschau, 20 {1910), No. 17, p. 



"Compt. Rend. Soc. Biol. [Paris], 67 (1909), p. 809. 

 &Jour. Med. Research, 13 (1904), p. 409. 

 « Jour. Path, and Bact., 13 (1909), p. 232. 



