CONTENTS. xxi 



Pnge 



Eyes of insects, arachnida, and cnistacea 417 



Feet of insects, &c. ;i,. 



Hairs of insects, &c. 418 



Parts about the mouth of insects, &c. ib. 



Parasitic insects 41 9 



Method of obtaining the acarus or itch insect 421 



Scales of insects 423 



Spiracles and tracheae of insects ib. 



Stings 424 



Stomachs ib. 



Preparations from the higher animals 425 



Blood ib. 



Bone - 426 



Teeth 427 



Fossil teeth 428 



Shell ib. 



Scales of fish 429 



Hairs • 432 



Skin 433 



Eyes 436 



Muscular fibre 437 



Mucous membrane 438 



Epithelium 439 



Method of viewing the ciliary movement - 440 



The basement membrane - 442 



Method of examining the surface of mucous membranes 443 



Objects for polarized light 447 



Selenite 449 



Crystals of salts ib. 



Currents in fluids observed during their evaporation 451 



Minerals 452 



Biniodide of mercury 453 



Tongue of whelk and limpet 454 



CHAPTER XIX. 



Methods oe Examining Moebid Structures, &c. 456 



CHAPTER XX. 



Test Objects 458 



Angle of aperture 461 



Methods of measuring the angle of aperture 464 



List of test objects 466 



