CONTENTS. ix 
Indigestible substances — Epidermic productions — Fibro-elastic 
tissue—M ucin—Pepsin—Urea—Chitine—Cellulose—Gun-cotton — 
Chlorophyll—Fat and oil—Starch—Action of the secretion -on 
living seeds—Summary and concluding remarks Pages 71-110 
CHAPTER VII. 
Tut Errects or Sauts or AMMONIA. 
Manner of performing the experiments—Action of distilled water in 
comparison with the solutions—Carbonate of ammonia, absorbed 
by the roots—The vapour absorbed by the glands—Drops on the 
disc—Minute drops applied to separate glands—Leaves immersed 
in weak solutions—Minuteness of the doses which induce aggrega- 
tion of the protoplasm—Nitrate of ammonia, analogous experiments 
with—Phosphate of ammonia, analogous experiments with—Other 
salts of ammonia—Summary and concluding remarks on the action 
of salts ofammonia «0. 6. eee we eee «TAD-141 
CHAPTER VIII. 
Tau EFrecrs OF VARIOUS OTHER SaLts, AxD AcIDS, ON THE LEAVES. 
Salts of sodium, potassium, and other alkaline, earthy, and metallic 
salts—Summary on the action of these salts—Various acids— 
Summary on their action .. 6.0 0. ee ee een 142-161 
CHAPTER IX. 
Tue Errects oF CERTAIN ALKALOID Porsons, OTHER SUBSTANCES 
AND VAPOURS. 
Strychnine, salts of—Quinine, sulphate of, does not soon arrest 
the movement of the protoplasm— Other salts of quinine — 
Digitaline — Nicotine — Atropine —Veratrine—Colchicine—Theine 
—Curare—Morphia—Hyoscyamus—Poison of the cobra, apparently 
accelerates the movements of the protoplasm—Camphor, a powerful 
stimulant, its vapour narcotic—Certain essential oils excite move- 
ment—Glycerine—Water and certain solutions retard or prevent 
the subsequent action of phosphate of ammonia—Alcohol innocuous, 
its vapour narcotic and poisonous—Chloroform, sulphuric and 
nitric ether, their stimulant, poisonous, and narcotic power— 
Carbonic acid narcotic, not quickly poisonous — Concluding 
TOMATKG ds eases wwe TSZEL SG 
