CONTENTS. XV 

 CHAPTER XVII. 



INSECTS AND ARACHNIDA. 



PAGE 



Great number and variety of Objects afforded by Insects, . . . 554 



Structure of Integument, ...... 555 



Tegumentary Appendages, ....... 556 



Parts of the Head, ....... 561 



Circulation of the Blood, ....... 569 



Respiratory Apparatus, . . . . . . . 570 



Wings, 574 



Feet, 576 



Stings and Ovipositors, ....... 578 



Eggs, . . . . . . . . 579 



Acarida, ......... 581 



Parts of Spiders, ..... .583 



CHAPTER XVIII. 



VERTEBRATED ANIMALS. 



Primary Tissues, . . . . , . . . 584 



Bone, ........ 584 



Teeth, 588 



Scales of Fish, . . . . . . . 591 



Hairs, ......... 594 



Feathers, ........ 597 



Hoofs, Horns, &c., ...... 598 



Blood, 598 



White and Yellow Fibres, . . . . . .602 



Skin, Mucous, and Serous Membranes, .... 604 



Epidermis, ........ 605 



Pigment-Cells, ....... 605 



Epithelium, ........ 606 



Fat, . . . . . . . . . . 607 



Cartilage, ........ 608 



Glands, ........ 609 



Muscle, . . . . . . . . . 611 



Nerve, . . . . . . . . 614 



Circulation of the Blood, . . . . . . .616 



Injected Preparations, . . . . . . . 619 



Vessels of Respiratory Organs, ...... 624 



CHAPTER XIX. 



APPLICATIONS OF THE MICROSCOPE TO GEOLOGY. 



Fossilized Wood, Coal, . . . . . . .625 



Fossil Foramiriifera, Chalk, ...... 631 



Nummulites, ........ 634 



Orbitoides, . . . . . . . . 637 



Organic materials of Rocks, ...;.. 639 



Structure of Fossil Bones, Teeth, &c., ..... 641 



