98 ELEMENTARY PHYSIOLOGY. 



Difference be- 



As has been shown, the bile, secreted 



tween sec-re- f rom the blood, is utilized in the diges- 

 tions of the 

 Liver and tive process. But the secretions 



Kidneys. Q ^ Q kidneys are poisonous to the 

 system, cannot be used in any process whatever, 

 hence must be at once removed from the system. 

 Thus the kidneys are exclusively excretory organs. 



LESSONS FROM THE MICROSCOPE. 



There are about us myriads of wonder- 

 ful creations which cannot be perceived 

 by our unaided senses. Our sense of sight is not 

 sufficiently acute to see the countless numbers of 

 minute living bodies which throng every drop of 

 water taken from a pond. We can not see the tiny 

 corpuscles which float in the blood and give it its 

 color, just as indigo dissolved in water will give it a 

 blue color. Many persons know nothing of the 

 wondrous beauty with which God has clothed the 

 insects which swarm about us. With the unaided 

 eye we see no beauty in the so-called dust which 

 covers the wings of our moths and butterflies. But, 

 when we call to our aid proper instruments, made 

 for the purpose, the dust on the wings and body of 

 the butterfly is at once transformed into beautifully 

 formed scales, of brillian: rainbow colors and the 

 most perfect shape and structure. The instrument 



