98 ANIMAL RESOURCES OF THE UNITED STATES. 
2, PRESERVATION OF GAME, FISH, &c.—Continued. 
b. Fish-ways: 
Steps contrived by arrangement of rocks and bowlders, 
Inclined plane without steps: 
Plain, (Pennsylvania.) 
With partitions at right angles: 
“ Rectangular compartment.” 
Brackett’s. 
With oblique partitions : 
Foster’s. 
Swazey’s. 
*** From natural enemies. 
c. Apparatus for destroying injurious species : 
Oyster-bed tangles, (see under B, 12.) 
3. CARE OF ANIMALS IN CAPTIVITY. 
a. Tethers and hopples. 
b. Cages and peus: 
Kennels for dogs, &c. 
Cages for animals. 
Cages for birds. 
Cages for insects. 
(West India fire-fly trap.) 
ce. Fish-cars and other floating-cages for aquatic animals. 
d. Aquaria: 
Globes. 
Aquaria. 
e. Hives and other cages for insects. 
jf. Live-boxes, troughs, &c., for microscopists’ use. 
g. Fish-ponds, fish-farms, (models.) 
4. ENEMIES OF USEFUL ANIMALS. 
a. Intestinal worms and other internal parasites. 
b. Fish-lice, barnacles, and other external parasites. 
e. Predatory animals not elsewhere exhibited. 
~ IEE PROPAGATION. 
5. PROPAGATION OF MAMMALS. 
a. Methods of mink culture. 
. b. Methods of culture of domesticated animals. 
