general bacteriology 
27 
when artificially grown, certainly corroborates this view, 
as pneumococcus needs more resistance, when in the ani¬ 
mal body, to exist than in a culture tube. With the ex¬ 
ception of pneumococcus mucosus capsulatus (pneumococ- 
l'ig. 3.—Typhoid bacilli, showing flagella. (Mallory and Wright— Patho¬ 
logical Technic .) 
cus, Type III) bacteria have to be stained by special 
methods in order to demonstrate their capsules; this is 
a very important procedure in making bacteriologic diag¬ 
nosis in the case of pneumococcus, gas bacilli, etc. 
