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 Jodis venaria (Small Emerald Butterfly). 



PLATE YIL— Page 655. 



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 pai)illai, 

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

 — 153. Kidney of cat, showing Malpigliian 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 pliase 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 sliow the value of injected preparations 

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

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

 ol)tained 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, papilla?, &c. 



PLATE YUl.—Toface Title. 



POI,ARISCOPE OBJECTS. 



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

 — 162. Saliginine — 163. Suljih. Iron and Cobalt, crystallized in the way 

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

 Kreatine — 167. Starch granules — 168. 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 ciystals 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 iu 

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

 ])resent, are those which may be submitted to this mode of irdcro- 

 chemical investigation. 



a 



