Micro-organisms oe Maple Sap 



583 



l\r.li: 72. GROWTH ON A t ■ 1 1 > AND ALKALI MEDIA AFTEB 3 DAYS 



Reaction after 



Strain 



Ps 



Ps 

 Ps 

 Ps. 

 Ps 

 Ps 



alba, 



fluorescens, 

 longa, 

 mesenterica, 



tenuis. 

 putrida, 

 CXI I, 



cxv, 



CXL, 



CXLV, 



CXLVIII, 



XXXVI, 



LI, 



+3.0 



+ 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 

 + 

 + 

 + 



+0.4 



+ 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 



+ 



days. t ( Fuller's scale) 

 —2.2 —3.3 —10.0 



+ - 



1 l.C 



+ 



+ 



Strain 



Ps. nlbit. 



Ps. fluorescens, 



Ps. longa. 



Ps. mesenterica. 



Ps. tenuis. 



Ps. putrida. 



CXII, 



CXV, 



CXL, 



CXLV, 



CXLVIII. 



XXXVI, 



LI, 



Reaction after :! days. (Fuller's scale) 



—20.0 



+10.9 



+ 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 

 + 

 + 

 + 



• 34.G 



+, growth; — , no growth; ±, doubtful growth. 



6. Optimum reaction for grozi'th in bouillon. — In connec- 

 tion with the experiments on the toleration of sodium hydroxid 

 and hydrochloric acid, observations were made after a day's in- 

 cuhation as to the optimum reaction for growth. The best 

 growth with all strains was found to occur in a very slightly acid 

 medium. The figures given in table y$ represent the original 

 reaction of the media in which growth occurred in 24 hours 

 ( c. f. page 582 for actual reactions). The reactions at which 

 the best growth occurred are shown in black face. 



