IV CONTENTS. 



CHAPTER VII. 



Organs of Insects Wings Function of the Halteres 

 Drum and File of House Cricket Foot of Fly Hind 

 Foot of Bee Stings and Ovipositors Spiracles and 

 Tracheae Pap 71 



CHAPTER VIII. 



Eggs of Insects Of Butterflies, Water Scorpion, Man- 

 gold-wurzel Fly, Gnats Hairs and Scales of Insects, 

 and of Fish Structure of Human Hair, of Bat's Hairs, 

 of Musk Deer Structure of Bone . . . Page 81 



CHAPTER IX. 



Structure of Skin Pigment Cells Change from Black to 

 White in Negro Perspiratory Glands and Ducts 

 Blood Corpuscles The Microscope in detecting Adul- 

 terations in Food and Medicine Crystals . Page 92 



CHAPTER X. 



The Microscope in Geology Fossil Diatomaceae Fora- 

 minifera Polycystina Deep-sea Soundings Chalk 

 Globigerinae Sponges in Flint Xanthidia in Flint 

 Eozoon Canadense ...... Page 105 



CHAPTER XL 



Vegetable Origin of Coal Mineral Composition of Rocks 

 Nature of Animals ascertained by Examination of 

 Minute Fossil Parts Old Red Sandstone of Russia 

 determined by a Microscopic Section of a Tooth Iden- 

 tity of the Keuper Sandstein of Wurtemberg with the 

 New Red Sandstone of Warwickshire similarly deter- 

 mined Page 116 



CHAPTER XII. 



The Collecting and Mounting of Objects Test Fluids 

 Conclusion Page 123 



