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 
CHAPEBReViIE 
Tne EFFECTS oF SALTS oF 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 
i ; in weak solutions—Minuteness of the doses which induce aggrega- 
l 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 
bate CF MORIA o n a ae e ee ee 
CHAPTER VIII. 
y THE EFFECTS OF VARIOUS OTHER SALTS, AND ACIDS, ON THE LEAVES. 
Salts of sodium, potassium, and other alkaline, earthy, and metallic 
salts—Summary on the action of these salts—Various acids— 
unitary on their action .: e <e ao oe o o DEINE 
CHAPTER IX. 
THE EFFECTS OF CERTAIN ALKALOID POISONS, 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—H yoscyamus—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 
remarks ae s, e cae ky e oe cee 5 0 LO 
