parke's list,' etc. 
Ophthalmia, 
Syphilis, 
Gonorrhoea, 
Tetanus. 
CLASS IV. 
Erysipelas, 
Septicaemia, 
Hospital Gangrene, 
Puerperal Fever. 
CLASS V. 
Tuberculosis, including Lupus and Scrofula. 
I. —Diseases placed in class one are designated 
as air-borne, or, in other words, diseases which 
may be carried and communicated by floating 
dust. 
II. —It is claimed that diseases placed in class 
two may be carried and communicated by floating 
dust or taken into the system in water. The “air 
or water borne” diseases, so-called. 
III. —Inoculation, as a rule, is the means of 
communication of diseases mentioned in class 
three. . v 
IV. —A surface lesion is said to be necessary 
for the communication of diseases in class four. 
When this lesion is present the disease is com¬ 
municable by direct inoculation or may be trans¬ 
mitted through the air. (By “lesion” we mean a 
wound, hurt, or other local alteration of tissue 
from a higher to a lower condition.) 
V. —In class five a surface lesion is not neces¬ 
sary and the disease is communicable either by 
direct inoculation or through the air. 
35 
