EXPLANATION OF PLATES. xiii 



FIG. 



6. Sarcolemma of striped muscle (effect of water). 



7. Effect of acetic acid on striped muscle (frog). 



8. Isolated striped muscular fibre. 



9. Muscle-discs. 



10. Muscular fibre splitting into fibrils. 



1 1. Striped muscle of a crab. 



12. T. S. of a striped muscle. 



13. Blood-vessels of an injected muscle. 



PLATE VIII. NERVE-FIBRES. 



(To face p. 44.) 



1. Fresh medullated nerve-fibres (myeline drops). 



2. Fresh medullated nerve-fibres (nodes of Ranvier). 



3. Effect of osmic acid on nerve-fibres (H). 



4. The incisures of Schmidt. 



5. Effect of osmic acid (L). 



6. Non-medullated nerve-fibres. 



7. Nerve-fibre (medullated) after chromic acid. 



8. Small nerve silvered (Ranvier's crosses) (L). 



9. Nerve-fibre silvered (Ranvier's crosses) (H). 

 i o. T. S. of a sciatic nerve (L). 



it. T. S. of a sciatic nerve (H). 



12. Concentric lines in the myeline of nerve- fibres. 



PLATE IX. HEART AND BLOOD-VESSELS. 



(To face p. 50.) 



1. Muscular fibres from the heart of a mammal. 



2. T. S. of the muscular fibres of the heart of a mammal. 



3. Muscle-cells from Purkinje's fibres of a sheep's heart. 



4. Capillaries silvered. 



5. Small artery silvered. 



6. Non-striped muscle in a small artery. 



7. Small artery after acetic acid, or stained. 



8. V. S. of a middle-sized artery. 



PLATE X. TRACHEA AND LUNGS. 



(To face p. 56.) 



1. T. S. of the trachea (L). 



2. Part of Fig. i with (H). 



3. T. S. of a bronchus and blood-vessels at the root of a lung. 



PLATE XL LUNG. 



(To face f. 58.) 



1. Part of a bronchus (H). 



2. V. S. of the pleura and air-vesicles. (L). 



3. Air-vesicles of a lung stained. 



4. Air-vesicles of a lung silvered. 



5. Injected blood-vessels of a lung (L). 



6. V. S. of a foetal lung. 



