LIST OF ILLUSTRATIONS 



PAGE 



Human Hair 15 



Hog's Bristle 18 



Fibre of Sheep's Wool 20 



Hair of Cat 20 



Hairs of Mole 20 



Hair of Sable... 22 



Hair of Mouse 22 



Tip of Small Hair of Mouse 23 



Hair of Bat 24 



Hair of Indian Bat 24 



Tip of Hair of Dermestes 27 



Barb of Clothing-Feather of Fowl 29 



Barb from Goose-quill 29 



Scales of Perch 30 



Scales of Gold-fish , 32 



Scale of Flounder *. 34 



Scales of Pike t 36 



Spicula of Gold-fish's Scale 37 



Blood Disks , 42 



Circulation in Frog's Foot . . 45 



Perophora 47 



Cuttle-Shell 55 



Section of Nacre from Pearl Oyster 58 



Tongue of Trochus 63 



Structure of Eye in Snail 71 



Leafy Sea-mat 79 



