NATURE-STUDY LESSONS. 79 



I. The Eggs. 



1 8. Observe the projections on some grasshoppers from 

 the last segment of the abdomen. 



The projection at the extremity of the abdomen of the female is the 

 ovipositor. Through this the eggs are deposited. 



(«) Discover, if you can, the holes in the ground — 

 the nests — made by the grasshopper in 

 which to deposit her eggs. 



{b) Make a drawing of a nest and of an egg. 



J. Observations for Advanced Class. 



19. Discover to what extent the structure of the grass- 

 hopper agrees with that of the bee, the house-fly and the 

 cricket, and to what extent it differs. 



20. (a) Immerse a partially-anaesthetized form in 



alcohol and observe that small bubbles of 

 air are expelled. The contraction of the 

 body will force bubbles of air, which can 

 readily be seen from the openings on the 

 abdomen and thorax. 



(6) Remove a part of the body near these open- 

 ings ; with needles take out and examine 

 under a microscope the spirally-wound 

 trachea. 



21. (a) Remove the crystalline covering of the com- 



pound-eye and examine part of it under a 

 microscope. 



((5) Make drawings representing the appearance. 

 Each of the hexagonal spaces represents a single eye. 



