106 The Mickoscope. 



less, unless the exposure is pushed to a longer pei'iod, when this 

 portion of the body will eventually color. The capsule of these germs 

 seems to be composed of the same material as the ends, as it also 

 colors in the same manner, thus presenting a delicate line of colored 

 material, connecting the two colored, coccoid ends, or poles. The 

 most practical illustration which can be given of the microscopic 

 appearance of these organisms is to take a small white bean and 

 paint both of its ends and two of its sides, blue or red, leaving 

 the middle portion unpainted. Looking down upon such a bean 

 would give almost an exact picture of these germs. 



6 



7 8 



Like the genuine and only germ of the American swine-plague 

 (Mr. Salmon has split this disease into two and forged for one, 

 which he now calls "hog-cholera," a description of a germ which 

 does not exist, while for the other he has been forced to adopt the 

 germ discovered by Detmers and myself), the micro-organism of the 

 southern cattle plague is motile in fluid cultivating media when 

 studied microscopically, as ivell as in the serum from the blood of 

 diseased animals. The movements of the latter are, however, less 

 rapid or active than those of the former organism. 



In my earlier description of the micro-organism of the American 

 swine plague, I called attention to the great morphological variations 

 which it undergoes in its full cycle of development. These are its 

 morpho- vegetative phenomena. 



To one entirely unaccustomed to observing them, the first 

 appearance of a cultivation of these germs — more especially an old 

 one, would prove very puzzling. In fact the novice would very 

 often conclude that his cultures had become polluted by micrococci, 

 so plentifully are those objects, apparently, represented. They 

 simply represent a vegetative, embryonic period in the development 

 of this class of micro-organisms. Hueppe has fallen into the serious 

 error of endeavoring to classify these organisms by this vegetative, 

 morpho-condition. He calls them " Micrococci." To my mind it 

 woiild be equally sensible and logical to call an ovum a man, or an 

 apple seed an apple tree. It is far more practical for patho-biolo- 

 gists to stick to the name cocci for all round objects (not spores) 



