XX DESCRIPTION OF COLOURED PLATES. 



of the external hairs 144. Egg of Bot-Fly ; the larva just escaping 145. 

 Egg of parasite of Pheasant 146. Egg of Scatophaga 147. Egg of parasite 

 of magpie 148. Egg of Jodisvernaria (Small Emerald Butterfly). 



PLATE VII. Page 654. 



VERTEBRATA. 



Fig. 149. Toe of mouse, integuments, bone of foot, and vessels 150. Tongue of 

 mouse, showing erectile papillae, muscular layer, &c. 151. Brain of rat, 

 showing its vascular supply 152. Tongue of cat, showing fungi-form papillae, 

 with capillary loops passing into them, vessels, <fec.; perpendicular section 

 153. Kidney of cat, showing Malpighian turfts and arteries 154. Small 

 Intestine of rat, showing villi and layer of mucous membrane 155. Nose of 

 mouse, showing vascular supply to roots of whiskers 156. Vascular supply 

 to internal gill of tadpole, during one phase of its development 157. Sec- 

 tion through sclerotic and retina of cat's-eye, showing vascular supply of 

 choroid and other coats 158. Internal gill of tadpole, fully developed, exhi- 

 biting crests and vascular system, after Whitney. 



This plate is designed to show the value of injected preparations 

 in the delineation of animal structures. By thus artificially re- 

 storing the blood and distending the tissue, a much better idea is 

 obtained of the relative condition of parts during life, while we 

 receive much assistance in the elucidation of complicated and deli- 

 cate membranes, the appearance of erectile tissues, papillae, &c. 



PLATE VIII. To face Title. 



POLARISCOPE OBJECTS. 



Fig. 158. New Red Sandstone 159. Quartz 160. Granite 161. Sulph. Copper 

 - 162. Saliginine 163. Sulph. Iron and Cobalt, crystallized in the way 

 described by Thomas 164. Borax 165. Sulph. Nickel and Potash 166. 

 Kreatine 167. Starch granules 168. Aspartie Acid 169. Fibre-Cells, 

 Orchid. 170. Equisetum cuticle 171. Spicula Holothuria, Australia 172. 

 Spicula Holothuria, Port Essington 173. Deutzia Scabra ; upper and under 

 surface 174. Cat's tongue, process 175. Prawn shell, exuvia with crystals 

 of lime 176. Grayling scale 177. Scyllium oaniculum scale 178. Rhi- 

 noceros horn, transverse section 179. Horse hoof 180. Dytiscus, elytra 

 with crystals of lime. 



This plate is especially intended to illustrate the beautiful and 

 gorgeous spectacle produced by polarised light on the various 

 objects here grouped together. It will be seen that all structures 

 belonging either to the animal, vegetable, or mineral kingdoms in 

 which the power of unequal or double refraction is suspected to be 

 present, are those which may be submitted to this mode of miwo- 

 ohemical investigation. 



PLATE IX. Woodcut. Page 498. 



ASTEROIDEA ECHINID^I CRUSTACEA, &c. 



