1894 THE MICROSCOPE. 85 



ologist, inasmuch as thebacteriologist must be acquainted 

 with certain important chapters of vegetable physiology. 

 But they are by no means always simple, and they re- 

 quire the same amount of patience that is expected from 

 the man who carries out difficult physiological experi- 

 ments. First of all, a laboratory with facilities for cul- 

 tivating and experimenting with the many different 

 forms which come under observation, is necessary. Here 

 the species are determined and experimented with, an- 

 alyses are made, and first-hand information is obtained. 

 Next to this, comes a suitable chemical laboratory, ap- 

 paratus for photographing, etc. None of these things 

 are very expensive, and, if once obtained, retain their 

 value. 



Protococcus and How to Mount them. 



By ARTHUR M. EDWARDS, M. D., 



NEWARK, N. J. 



Red snow, which I have been looking at lately, though 

 one of the first organisms I studied, now nearly forty years 

 ago, I recently reported on in the Microscopical Journal 

 and this brought me to raking up what was known on that 

 subject. It also led to my gathering what was published 

 on the Protococcus, that common green slime on marshes 

 and on walls and fences everewhere. I thought that a 

 resume of the researches would be profitable and there- 

 fore put them down. I also made some experiments on 

 mounting the Protococcus which is rather a difficult thing 

 to do. For they do not possess any solid wall like my 

 friends the Bacillariacese being made up of protoplasm, 

 the most destructable thing we have to make permanent 

 mounts of. But I think I have at last succeeded in 

 mastering the problem and mastering the Protococcus 

 by killing the thing. 



For it cannot truthfully be said to be a plant, and it 

 will not be said to be an animal, although the earlier ob- 



