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 Yll.—Page 654. 



VERTEBRATA. 



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

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

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

 with capillary loops passing into them, vessels, &c; 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, papillse, &c. 



PLATE YIJI.—Toface Title. 



POLARISCOPE OBJECTS. 



Fig. 158. New Red Sandstone— 159. Qvartz— 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 — 16S. Aspartic Acid — 169. Fibro-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 caniculum scale — 178. Rhi- 

 noceros horn, transverse section — 179. Horse hoof — ISO. Dytiscus, elytra 

 with crystals of lime. 



This plate is especially intended to illustrate the beautiful and 

 goi'geous 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 micro* 

 chemical investigation. 



PLATE IX.— Woodcut.— Page 498. 



A.STEROIDEA— ECHINIDJS— CRUSTACEA, &c. 



