LIST OF ILLUSTRATIONS 



PAGE 



Head of Stick Insect 120 



fobaminifera 128 



Diatoms 128 



Stinging Hairs of Nettle 144 



Butterfly Wing Scales 144 



Crystals from Human Blood .... 168 



Crystals from the Blood of the Baboon . . 168 



Cluster Cups 184 



Rust of Wheat 184 



Pollen Grains on a Grass Flower . . . 184 



Lower Side of a Fern Frond . . . .184 



Head of a Beetle 200 



Head of Hercules Beetle 200 



A Cicada 200 



Head of Mantis . . . . . . . 200 



Face of a Fly 216 



Section of Human Skin 216 



14 



