144 



NATURE STUDY REVIEW [8 :4— April, 1912 



Not all of the forms which the young collector finds in the 

 pond or stream will be different kinds of insects but many will 

 be only different stages of some growing insect. In some cases 

 three different forms of one insect will be found, each of which 

 differs so widely from the others that the beginner may not sus- 

 pect that they have any connection with each other. Insects have 

 from three to four stages in' their growth from the egg to the 



Sta(;ks in Tin^. lifk History of the Dragon Fly. 4, the 



Nymph. 5, the Adult. 

 adult. The first stage is the egg. It hatches into the sebnd stage, 

 the Larva, which is usually a worm-like form and which is active 

 in its habits, eats greedily, grows, and sheds its tough skin several 

 times. The third stage, the Pupa, (not all insects have this stage) 

 is a resting stage in which the larva, in a very changed form, 

 passes some time before changing into an adult. In insects which 

 do not have the pupal stage the second stage is called a nymph. 

 In nymphs the wings begin to show themselves as little pads on 

 the top of the thorax. 



(to be continueo.) 



Lectures on Nature Topics 



The editor of the Review is in touch with persons in almost 

 all sections of the country who are available for lectures that 

 will help stimulate interest and arouse enthusiasm in nature work. 

 These parties are sufficiently devoted to this work to give their 

 service for a very little over expenses. Arrange for one or more 

 in your own community. 



