1019] VETERI1CABY MEDIUINR. 8*1 



hemolytic properties on boiling 33m addition of ninnd w&nm to tubes eon- 



taining a mixture of red blood corpuscles and body Muid nr extra*! of the 

 worms usually inhibits hemolysis. The hemolytic prope rty <>( tin- Hold and of 

 extracts of the worms can also !.<> destroyed by the :id.lit i<>n of I (Mil <piantity 



of laked bl I. Excretions of the vorms absorbed by the solution of sodium 



chlorid In which the parasites are kepi In vitro are not hemolytic" 



The causes of death among horses immunized with killed bacteria or bac- 

 terial extracts, K. IMiiaivs and K. Nicolas (Com/,/. Rtn4. \<>i,l. got, |/\m'.i], 

 168 (1919), No. 6, pp. 32J,~327).—The authors state thai in tl OUTM of im- 

 munization of horses to obtain antimicrobial and antitoxl ral deaths 

 have occurred in a few minutes after Intravenous Injection of the bacteria or 

 bacterial extracts. The theories are discussed as to whether this phenomenon 

 is due to hypersensitivoness to bacterial proteins or to the bacterial toxins, the 

 evidence apparently being in favor of the latter. 



The effect of acids on the growth of Bacillus coli, F. J. S. Wvi.nt (BUh 

 ,lnm. Jour.. 1% (1918)* No. 1,. pp. S82-J f 0t, fig*. 7).— Experimental data <>n the 

 effect of acids on the growth of human and bovine strains of B. OOU are reported 

 from which the following conclusions are drawn : 



All strains of Ii. coli, whether of human or bovine origin, behave similarly 

 when exjxised to similar conditions. The degree of acidity of the final reaction 

 produced by a culture of B. coli can not be used for diagnostic pnrposi - I this 

 value is not a "physiological constant," but depends upon the initial Hdoa con- 

 centration of the medium in which fermentation occurs, the composition of the 

 medium, and the nature of the acid used to produce the initial reaction of the 

 medium. Each acid appears to have a specific effect in inhibiting the gr o wth of 

 B. coli in a given medium, highly dissociated acids being more strongly Inhibitory 

 than less highly dissociated. For a mixture of any given medium and acid there 

 appears to be a definite critical point beyond which the slightest rise in the 

 degree of acidity results in it complete inhibition of the growth of H. OOli, 



The use of blood agar for the study of streptococci, J. II. Ukown (Mono- 

 graphs Rockefeller Inst. Med. Research, No. 9 (in 19). pp. IV+ltX +[76], />'*• 

 .?.}). — This monograph Includes a detailed study of the appearances produced 

 by the growth of streptococci in blood agar made with defibrinated horse blood; 

 and of the influence upon the growth of the streptococci of age and kind of 

 blood, composition of the agar, anaerobiosis, and the presence of other typos of 

 streptococci. This is followed by a discussion, based upon the author's stni 

 and the literature of the subject, of the causes of various appearances in blood 

 agar, the permanence of cultural characteristics, and the occurrence and classifi- 

 cation of the various types of streptococci. A tabular description is given of the 

 principal strains referred to in this work and of Btreptococci with reference to 

 type of appearance in blood agar and fermentation reactions. A system ofnoi 

 for preserving the genealogy and other details in the study of bacterial CUltni 

 and a method of making photographic records of growth on agar and blood agar 

 plates are described. 



In addition to a bibliography, an extensive review of literature on streptococci 

 and streptococcus infections is presented in tabular form under the following 

 topics: The use of blood agar, the use of blood bouillon and other Quid media. 

 fermentation reactions, pathogenicity and virulence, mutations and variability, 

 and general conclusions with reference to the correlation of source, patho- 

 genicity, hemolysis, fermentation reactions, etc. 



Bacteriological notes, P. [15.] Hadley, D. W. Cai.dwf.i i . and B. If. Hf.vth 

 {Jour. Bad., 4 (1919), No. 1, pp. 65-69).— In the course of bacteriological studies 

 on avian diseases at the Rhode Island Experiment Station, the following ob- 

 servations were made: 



