no A GUIDE FOR THE STUDY OF ANIMALS 



draw blood into itself, i.e. is the heart a force pump or is 

 it a suction pump ? 



9. How is circulation made complete ? If the heart is a 

 force pump, is its power sufficient to drive blood through 

 artery, capillary, vein, and into auricle, if the capillaries 

 can stand the pressure, or is another action concerned ? If 

 it is a suction pump, why does the blood leave the heart ? 



Suggested drawings. 



a. The body cavity, with viscera undisturbed. 



b. The alimentary canal extended. 



c. The anterior end of the fish with the sinus held open, 

 to show the general situation of the parts. 



d. The heart in its chamber, with the outgoing vessels 

 as far as dissected. Use arrows to show direction of 

 circulation. 



e. A copy of some good diagram or chart which illus- 

 trates the heart of the fish with the connecting veins and 

 arteries. 



Fishes: A General Review and Library Exercise 



1. Food and the feeding habits of young and of adult 

 fishes. 



2. The diet and habits of cod ; lantern-fish ; swordfish ; 

 ramora ; hagfish ; angler ; gar-pike ; sturgeon ; shark ; 

 sawfish ; paddle-fish. 



3. The variations, real or apparent, in the breathing 

 habits of the porcupine-fish; the climbing-fish; the lung- 

 fish. 



• 4. Peculiarities in swimming as seen in the flying-fish ; 

 the flounder ; the sea-horse. 



5. Intensity of sound under water, and the corresponding 

 structure of the fish's ear. 



