Viii CONTENTS. 
CHAPTER IX. 
Tue 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 — Hyoscyamus — 
Poison of the cobra, apparently accelerates the movements 
of the protoplasm -—  Camphor, a powerful stimulant, its 
vapour narcotic — Certain essential oils excite movement — 
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 .. .. .. Pages 199-228 
CHAPTER X. 
On THE SENSITIVENESS OF THE LEAVES, AND ON THE LINES 
or TRANSMISSION OF THE Motor ImpuLse. 
Glands and summits of the tentacles alone sensitive — Trans- 
mission of the motor impulse down the pedicels of the 
tentacles, and across the blade of the leaf — Aggregation of 
the protoplasm, a reflex action— First discharge of the 
motor impulse sudden — Direction of the movements of the 
tentacles — Motor impulse transmitted through the cellular 
tissue — Mechanism of the movements — Nature of the 
motor impulse — Re-expansion of the tentacles .. 229-261 
CHAPTER XI. 
REOAPITULATION OF THE CHIEF OBSERVATIONS ON 
DROSERA ROTUNDIFOLIA. 
262-277 
