692 
VERANUS A. MOORE. 
Klein * * * § maintained that streptococci which appear on super¬ 
ficial examination to be identical can be differentiated by a more 
thorough study of their properties. Lucet f separates S. pyo¬ 
genes from cattle from S. pyogenes from man without, however, 
mentioning any difference in morphology or properties. In a 
former study j of this genus of bacteria twenty-eight different 
cultures were isolated and certain of their properties determined. 
Fifteen of the twenty-eight were isolated from the tissues of 
animals which were known to have succumbed to specific 
diseases, such for example as hog cholera, swine plague, Texas 
fever and glanders. The others were obtained from the organs 
and tissues of animals which died from causes not definitely 
determined. A comparison of the morphology and biochemic 
properties of these twenty-eight streptococci showed that no two 
of them were exactly alike, and yet many of them were so simi¬ 
lar in all of their manifestations that a specific or even varietal 
distinction seemed unjustifiable. Whether a more extended 
series of tests would have widened the difference is not known. 
The evidence accumulated concerning their disease-producing 
power led to the conclusion that in every instance they were of 
secondary importance only. 
A few investigators have tried to eliminate the confusion 
concerning species by classifying streptococci according to dis¬ 
tinct morphologic characters, and pathogenic properties. Of 
these classifications the following may be mentioned : 
I. The classification of von Lingelsheim. § This author 
divides all streptococci into two groups, or species ; namely: 
(ci) Streptococcus brevis —Which is non-pathogemc. 
(b) Streptococcus longus —Which is pathogenic. 
In this we find a combination of pathogenesis and morph¬ 
ology which the author thought applicable to the entire genus. 
* Seventeenth Annual Report of the Local Government Board, supplement containing 
report of Medical Officer. London, 1887, p. 256. 
t Annales de l’lnstitut Pasteur. Tome VII. (1893), p. 324. 
+ Bulletin No. 3, U. S. Bureau of Animal Industry, Washington, D. C., 1893. 
§ Zeitschrift f. Hygiene Bd. X. 1891, S. 331. 
