SYSTEMATIC AND DESCRIPTIVE. 135 



Sections of pneumonic lung should be stained by 



(a) Method of Gram. 



(b) Method of F.riedldnder. This method is employed to 

 demonstrate the capsules in tissue sections. It consists in 

 placing the sections twenty-four hours in the following 

 solution : 



Fuchsine I 



Distilled water .... 100 



Alcohol ...... 5 



Glacial acetic acid ... 2 



They are then rinsed with alcohol, transferred for a couple 

 of minutes to a 2 per cent, solution of acetic acid, and in 

 the usual way treated with alcohol and oil of cloves, and 

 preserved in Canada balsam. 



Bacterium Pfliigeri, Ludwig. Large, round 

 cocci, mostly in zoogloea, and thread-forms com- 

 posed of rods. They can be cultivated on boiled 

 white of egg and potatoes. They were observed to 

 produce phosphorescence in putrid fish and meat. 



Bacterium ianthinum, Zopf. Long and short 

 rods, which aggregate in swarms, and finally break 

 up into cocci. Observed on pieces of pig's bladder 

 floated on the surface of water, rich in bacteria, from 

 the river Panke. They formed spots of an intense 

 violet colour, measuring from i 10 mm. They oc- 

 curred only on the surface of the bladder exposed 

 to the air, and never on the part under water. The 

 colouring matter is soluble in alcohol. 



Bacterium synxanthum, Ehrenberg (xan- 

 thinum. Bacterium of yellow milk). Cocci "j i p 

 long, and rod-forms.* They are actively motile, 



* Zopf, Die Spaltyilze. 



