546 Dr. E. W. A. Walker. [Feb. 18, 
RESULTS. 
In the earlier observations I examined a considerable number of strepto- 
cocci of known origin which were available at different times, and noted 
their reactions, subsequently comparing the results thus recorded with those 
obtained after a longer or shorter period of cultivation in stab agar as 
laboratory stock. Three sets of observations illustrate the character of the 
results thus obtained :— 
Table IL—Streptococcus B. Showing Six Changes of Reaction between 
June, 1907, and May, 1908. 
6 2 L 4 ® n © 
Date of testing. cS & 2 g S| A= 7 Sp ee 
rid 5) * = = i g a ss 
=| S 3 ae =| = S =| oS 
= a | a= i op) = 'é) <a 
June, \OO7ie 1. eee CPT eee) | ua OMPIPIMTeR UO Nb) ori bol kc 
January, LO08 gia eeee | O + | + | + O 0 O 3 
May, 1908. o.tccsi.das.ase-t + +O) 5 tO Pala se + 0 GAO 8 6 
Streptococcus B.—This was isolated from a case of acute rheumatism by 
Dr. Bushnell, in 1907, and sent to me for examination of its formic acid 
production. 
Table I1.—Streptococcus E. Showing Two Changes of Reaction after Three 
Months’ Cultivation in Stab Agar. 
| f | | 
; 
Ss 9 2 ; x nn 
Date of testing. © & B S = a 4 ep 
= Sins) |) 2 Sa es a | 8 
= wn 4 pA 4 wD = 5 
| - oa —_ in | i | z f. 
Auoust 8.71910 ne key c eee ene | 0 + +) O | + + + 
November 15, 1910) ieee. pascke | O + + + | 0 + + 2 
Streptococcus E, tested when freshly isolated from horse-dung, and again 
after 14 weeks. 
