LIST OF ILLUSTRATIONS. 



Page 



Human Hair 3 



Hog's Bristle G 



Fibre of Sheep's Wool 8 



Hair of Cat 9 



Hairs of Mole 9 



Hair of Sable 10 



Haik of Mocse 11 



Tip of Small Haih of Mouse 11 



Hair of Bat H 



Hair of Indiah Bat 12 



Tip OF Haik of Dermestes 15 



Barb of Clothing Feather of Fowl 16 



Barb from Goose-quill 17 



Scales of Perch 19 



Scales of Goldfish 21 



Scale of Flounder 23 



Scales of Pike 24 



Spicula OF Goldfish Scale 25 



Blood Disks 31 



Circulation in Fkog's Foot 35 



Perophoba 36 



Cuttle-Shell 45 



Section of Nacre from Peakl Oyster 48 



Tongue of Teochus 54 



Structure of Eye in Snail 62 



Leafy Sea-mat 70 



Doubling and Hooks in a Bee's Wing 83 



