SYSTEM OF CLASSIFICATION. 21 
GROUP 4i. 
FISH CULTURE. 
Class 259—The history of fish culture. 
Class 260—-Hatching, breeding and rearing establishments, 
including oyster and other shell fish grounds. 
Class 261—Apparatus and implements connected with fish 
culture, and for transporting fish and fish ova. Food 
for fry. 
Class 262—Representations illustrative of the development and 
progressive growth of fish. 
Class 263—Models and drawings of fish ways and fish ladders. 
Class 264—Diseases of fish, with special reference to their 
origin and cure. Models and drawings. 
Class 265—Processes for rendering streams polluted by sew- 
age and chemical or other works innocuous to fish 
life. (Illustrated by models and drawings. ) 
Class 266—Physico-chemical investigation into those qualities 
of salt and fresh water which affect aquatic animals; 
investigation of the bottom of the sea and of lakes, 
shown by samples; aquatic plants in relation to fish- 
ing, etc.; researches into the aquatic fauna (animals 
of the several classes, preserved in alcohol or pre- 
pared, etc.); apparatus and implements used in such 
researches, 
Class 267—Acclimatization of fish. Marking of introduced 
fish for purposes of identification. 
Class 268—Statistics of the results of fish culture. Speci- 
mens of fish artificially propagated or introduced. 
