PROBLEM 11^6 h;1 



come out? What gas is in tho water? How !iii^r},j jl„. fish use 

 this gas? How might this gas come ifi conlacl with ihc gills? 



Conclusion. — Tell just how a fish hn^athes, writing a i)aragraph 

 in explanation and illustrating with a diagram. 



Troble^n 134 : To study food getting bjj the fish. 



Material. — Live fish. 



Method. — Watch the fish to see if it will eat. Ilememher 

 what you know about catching fish. 



Observations. — Do fish see or are they made aware of the 

 presence of food by other means? Do fish have teeth? Do they 

 chew their food? Give uses of teeth. How does the fish's means 

 of obtaining food compare with ours ? 



Conclusion. — Write a paragraph telhng how a fish gets its 

 food. 



Prohle^n 13^ : To study the sense organs of tlie fish. 



Material. — Specimens of fish. 



Method. — Study the external sense organs of the fish. \\ hat 

 are they? 



Observations. — What shape are the eyes? Does a fish move 

 its eyes? Describe any movement. A fish is very nearsighted 

 owing to the shape of the eye. Find two nostril holes. These 

 lead to little pits in which are located the nerves of smell. Does 

 a fish breathe through its nose? Find a distinct line running down 

 the side of the fish. This is called the lateral line and contains 

 organs of sense. The ears of the fish are out of sight in the lu-id 

 and are largely used for balancing. 



Conclusion. — Write a paragraph telling how llu* fish is fitted 

 with sense organs. Compare its vision, sense of smell, and power 

 of lu^aring with your own in respect to keenn(\ss. 



Drawing. — Make a side view of a fish. Label all the struc- 

 tures we have discussed. 



rrohlem J 30 : To study some of the iuterual organs of a fish. 

 Material. — Preserved specimens with under body wall cut 

 away. 



HUNTER LAB. PROB. — 11 



