FORM AND FUNCTION 



269 



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FIG. 207. Side view, showing spir- 

 acle of mesothorax with spiracle en- 

 larged. 



This is one of the openings 

 of the respiratory system. 



It is called a spiracle. Ex- 







;ii i line the body of the liv- 



ing grasshopper and locate, 

 if you can, other spiracles. 



INTERNAL DIVISIONS OF THE BODY. 



The grasshopper, agreeing with higher forms of life, 

 has a digestive, circulatory, reproductive, respiratory, 

 excretory and nervous system. With the facilities at 

 hand we shall not be able to study all of these thor- 

 oughly. However, by means of the dissecting-stand, 

 lens, and with the addition of a pair of needles, we can 

 obtain some interesting facts. 



DIGESTIVE TRACT. 



Take a freshly killed specimen, clip off the wings, 

 pin the body down by the legs to a sheet of cork or thin 

 piece of some soft wood, and with a sharp-pointed pair 



