87 



165 



(Pl. XXXIV) is incompletely stained by the Gram process, in the same way as tliermo- 

 bacteria Nos. 12 and 13. It thrives well at ordinary temperature, but does not grow 

 at over 38°. It is thus not a thermobacterium, but in spite of this, it appears most nearly 

 related to those thermobacteria which form inactive lactic acid. As we are not quite 

 certain as to the systematic position of this bacterium, we must refrain from giving it 

 any name at present. On plate XXXIV it is designated as Thermobaclerium No. 15. 



