40 FIRST YEAR COURSE IN GENERAL SCIENCE 



(13) Examine a bean plant growing in a pot in the school- 

 room. What visible organs of this plant correspond to 

 organs of the embryo in the seed? 



EXERCISE XXXI (Textbook 339) 

 STUDY OF A FISH 



MATERIALS: A live fish in a jar of water. Goldfish can 

 be purchased for a small sum, if minnows or other common 

 fish cannot be obtained alive. If none of these is obtainable, 

 a fish market might furnish smelt, perch, or butterfish which 

 have not been " dressed." 



DIRECTIONS FOR WORK: 



(1) Compare the length, width, and thickness of the fish. 



(2) Describe its shape as a whole. In what respects is it 

 adapted to movement through the water? 



(3) Compare its two sides. 



(4) Compare its two ends. What advantage is there in 

 their being different? 



(5) Compare the upper and lower sides of the fish. Is the 

 same side always uppermost? 



(6) The head extends from the tip of the snout to the 

 hinder part of the flap on the sides, (a) How many times 

 the length of the head is the length of the body? (6) Is 

 there a neck? 



(7) Describe the shape of a fin, stating the position of the 

 fin selected. 



(8) (a) Locate all the fins, (b) How are the fins stiffened? 



(9) (a) Where must be placed the muscle that moves the 

 tail to the right? (6) Where the muscle that moves it to 

 the left? (c) What name is given to a pair of muscles so 

 related? 



(10) The flaps on the side of the head are the gill covers. 

 Describe their movements and tell why they move. 



