159 



others* by forming large capsules in milk (PI. XXVI) which do not disappear again (turn 

 into slime). Xos. 3 and 4 we can call Tc. mastiiidis, with the reservation, however, that it 

 may be found to be the same species which produces the so-called staphylococcus-ma- 

 stitis in cows; a point which I have not myself had any opportunity of investigating. 

 The table shows, as distinctly as could be wished, that there are many other points of 

 difference between (Tc.) Mc. pyogenes aureus and (Tc.) Mc. pyogenes albus than the colour 

 alone, and we are therefore perfectly justified in regarding them as two distinct species^). 

 The tetracocci which we have isolated from condensed milk and dung appear to be inter- 

 mediate links between these extreme forms. Xos. 30 and 31 can suitably be called Telra- 

 coccus mycodermalus. The true lactic acid bacteria as a rule coagulate milk in the deeper 

 layers first; this species, on the contrary, coagulates milk from the surface downwards. 



The only pj'ogenic Citreus-îorm I have investigated is. as mentioned, nou-sugar-fermenting, and 

 Gram-negative, and thus belongs to quite another genus. It liqueGes AG extremely slowly, and is not 

 able to reduce nitrate to nitrite. A number of saprophytic yellow micrococci behaved in the same way. 



D. K. D. Videnskab. Selsk.'Skr., naturvidensk. og mathem. Afd., S. R;ekke. V. 2 21 



