_Fig._ 149. Toe of mouse, integuments, bone of foot, and vessels--150. Tongue of mouse, showing erectile papillæ and muscular layer--151. Brain of rat, showing vascular supply--152. Vertical section of tongue of cat, fungi-form papillæ and capillary loops passing into them, vessels--153. Kidney of cat, showing Malpighian turfts and arteries--154. Small intestine of rat, with villi and layer of mucous membrane exposed--155. Nose of mouse, showing vascular supply to roots of whiskers--156. Vascular supply to internal gill of tadpole, during one phase of development--157. Section through sclerotic coat and retina of cat’s eye, showing vascular supply of choroid vessels cut cross-ways--158. Interior of fully-developed tadpole, exhibiting heart, vascular arrangement and vascular system throughout body and tail. This plate is designed to show the value, in certain cases, of injected preparations in the delineation of animal structures. By thus artificially restoring the blood and distending the tissues, a better idea is obtained of the relative condition of parts during life. PLATE VIII.--_Page_ 220. POLARISCOPE OBJECTS. _Fig._ 158. New Red Sandstone--159. Quartz--163. 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. Aspartic Acid--169. Fibro-cells, orchid.--170. Equisetum cuticle--171. Holothuria spicula, Australia--172. Holothuria spicula, 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. Rhinoceros horn, transverse section--179. Horse hoof--180. Dytiscus, elytra with crystals of lime. PLATE IX.--_Page_ 362. TYPICAL PLATE OF BACTERIA AND SCHIZOMYCETES.