EXPERIMENT STATION BULLETINS. 419 



a large number of the micro-organisms commonly found in butter are capable 

 not only of remaining alive, but of growing and developing at a compara- 

 tively low temperature when provided with a suitable nutrient pabulum 

 and protected from inhibitive substances. The identification of these or- 

 ganisms follows. 



CLASSIFICATION OF BACTERIA DEVELOPING AT A LOW TEMPERATURE 



COCCACE.E. 



Cocci. 



Non-liciuefying. 

 Non-acid. 



Non-chrom. (IX. F, XVII. E.) Streptococcus versicolor. 

 Liquefying. 



Acid. D. L. S. 



Non-chrom. (XIV. E, G,) Micrococcus lactis albidus. 

 Orange-Yellow. (VIII. C, XIV. B, XVI. B. D.) M. 1. varians. 

 Acid. Dext. only. 



Non-chrom. (XVIII. B.) M. 1. albidus, Var. C. 

 Orange. (VIII. D.) M. 1. varians 0. 

 Non-acid. 



Non-chrom. (X. F.) M. 1. albus. 



BACILLACE^. 



Bacteria. 



Non-liquefying. 



Acid. D. and S. 



Yellow. (XVII. C, XIX. B, D.) Bact. 1. aureum, Var. A. 

 Lic^uefying. 



Acid. Dextrose. 



Green fluorescence. (X. C, XL B.) Bact. I. fiuorescens. 

 Non-acid. 



Non-chrom. (VIII. B, X. A, XIV. F.) Bact. 1. album. 

 Brown-Orange. (XL E.) Bact. 1. luteum(?). 

 Bacilli. 



Non-liquefying. 



Acid. D. and L. 



Non-chrom. (XL C, XIX. E.) B. lactis sulcatus(?). 

 Liquefying. 



Acid. D. and S. 



Non-chrom. (XV. B.) B. 1. coch!eatus(?). 

 Non-acid. 



Yellow. (X. D, XVI. C.) B. 1. citronus(?). 

 Orange. (IX. H.) Ps. lactis anana(?). 



The following table shows the number of the various organisms dev loping 

 colonies in 30 days at a temperature of 5°C as compared with the organisms 

 developing in seven days on ordinary agar at 20 °C-22°<D. These organisms 

 may be identified by referring to the classification on this page and to 

 Table VIII. 



