ILLUSTRATIONS. 



FIG. FACE 



1. Schematic Longitudinal Section of the Human Body ... 4 



2. Human Skeleton ... ... ... ... ... 7 



3. Skeleton of an Ox ... ... ... ... ... 9 



4. Bending of the Arm by Contraction of the Biceps Muscle 10 



5. Diagram to explain the Action of the Motor and Sensory 



Nerves ... ... ... ... ... ... H 



6. Diagram of the Course of the Circulation ... ... 13 



7. Life History of the Small-winged Gall-fly {Andncus ter- 



mindlis) ... ... ... ... ... ... 15 



8. Diagram of a Fish's Heart ... ... ... ... 18 



9. Diagram of a Mammal's Heart ... ... ... ... 20 



10. Diagram of a Reptile's Heart ... ... ... 20 



11. Diagram of a Frog's Heart ... ... ... ... 21 



12. Vertical Section of a Human Grinding Tooth ... 22 



13. Crown of an Ox's Grinder ... ... ... ... 22 



14. Skull of Domestic Cat ... ... ... ... 25 



15. Fine Marten {Mustela martes) ... ... ... ... 27 



16. Skull of Mole 30 



17. Common Shrew {Sorex vulgaris) ... ... ... 31 



18. Skeleton of Bat ... ... ... ... ... 34 



19. Skull of Squirrel ... ... ... ... ... 35 



20. Abnormal Tooth in Hare ... ... ... ... 37 



21. Hamster (firicelvs frumentarias) ... ... ... 38 



22. Long-tailed Field ISIouse {Mus sylvaticus) ... 40 



23. Upper Back Teeth of Browu Eat ... ... ... 41 



24. Upper Back Teeth of Water Vole ... ... ... 41 



25. Southern Field Vole (Arvicola arvalis) ... ... ... 43 



26. Skull of Sheep 44 



27. Development of Eoebuck Antlers ... ... ... 45 



28. Wing of Buzzard ... ... ... ... ... 50 



29. Section through Bird's Egg ... ... ... ... .51 



30. Eagle Owl (Ofos maaitmiis) ... ... ... ... 52 



31. Head and Foot of Falcon ... ... ... ... 53 



32. Golden Eagle (Aquila chrysaetus) ... ... ... 54 



3S. BaTD. 0\il (Strix flammea) ... ... ... ... .'55 



34. Gackoo (^Oiuyulug canorus) ... ... ... ... 56 



35. GoatBaoker QCaprimiHgus ewropseus) ... ... ... 58 



36. Head of Eook ((707T.-M8 /i-Mgt7e(/us) ... ... ... 60 



37. Head of Bullfinch (Pi/rrAMte ru?3am) ... ... ... 62 



