CONTENTS 



9 



PROBLEM 



120. How animals may benefit mankind 



121. To find out bow birds are of economic importance 



122. What are the causes of decrease in the number of birds '.' 



123. To study tlie life liistory of the mosquito ..... 



124. To find the breeding places of mosquitoes in any locality :uid liow t« 



destroy them ......... 



125. To determine some methods of destroying mosfjuitoes 



126. To find the relation of mosquitoes to diseases of man 



127. To study the life history of the parasite causing malaria . 



128. To study the life history of the typhoid fiy .... 



129. To determine the harm done by the fly and the way it does this liarm 



130. What is the best way to catch and destroy flies ? ( Home work) 



131. To determine harm done by insects 



132. To know some forms of animal life that cause disease 



XVI. 



133. 

 134. 

 135. 

 13G. 

 137. 

 138. 

 139. 

 140. 

 141. 

 142. 

 143. 

 144. 

 145. 



146. 

 147. 



148. 

 149. 



Sttdy of 



The Fish and Frog, ax iNTRonucroKY 

 Vertebrates . 



To determine how a live fish is fitted for life 



To study food getting by the fish 



To study the sense organs of the fish . 



1 o study some of the internal organs of a fish 



lo study the skeleton and central nervous system of the fish (Kxtra 



Ilovv fishes are artificially jDropagated ...... 



Trip to the aquarium (Optional, in place of Problems 133 and lo8j 

 To determine some adaptations in a living frog . 

 Adaptations of appendages for locomotion . 

 Adaptations for sensation ..... 



Adaptations for food getting .... 



Adaptations for breathing ..... 



Museum trip to study the frog group (Extra problem based on trij 

 to American Museum of Natural History) .... 



To collect and study frogs' eggs 



To study conditions favorable for development of frogs' eggs 

 To study the metamorphosis of the frog .... 

 To work out a comparison of development of the vertebrates 



XVII. Heredity, Variation, Tl.vnt am> .\mm\i. HurKPixi; 



150. To determine if there is individual variation in any one niea.'^ure 



ment of the members of a given class . 



151. To show variation in a given class 



152. Does heredity play any part in our lives :' . 



153. To study the fine structure of an egg cell . 



154. How selection is made . . . • • 



155. A practical result of selection .... 



PAOK 



148 

 148 

 149 



119 



l.'.l 

 l.'.l 

 152 

 152 

 153 

 154 

 155 

 i:.5 

 15<I 



150 

 159 



i»;i 

 i«;i 



Kil 

 H52 

 1(>3 

 HJ3 

 164 

 165 

 165 

 1«5.-, 

 165 



nw; 

 lu: 

 \m 



108 

 169 



173 



174 

 176 



177 

 !> 

 178 

 179 



