CONTENTS. ix 



roots The vaponr absorbed by the glands Drops on the disc Minnte 

 drops applied to separate glands Leaves immersed in weak solutions 

 Minuteness of the doses which induce aggregation of the protoplasm 

 Nitrate of ammonia, analogous experiments with Phosphate of 

 ammonia, analogous experiments with Other salts of ammonia Sum- 

 mary and concluding remarks on the action of the salts of ammonia. 



Pages 111-141 



CHAPTER. VIII. 



The Effects of various other Salts, and Acids, on the Leaves. 



Salts of sodium, potassium, and other alkaline, earthy, and metallic salta 

 Summary on the action of these salts Various acids Summary on 

 their action 142-161 



CHAPTER IX. 



The Effects of certain Alkaloid Poisons, other Substances 

 AND Vapours. 



Strychnine, salts of Quinine, sulphate of, does not soon arrest the move- 

 ment of the protoplasm Other salts of quinine Digitaline Nicotine 

 Atropine Veratrine Colchicine Theine Curare Morphia 

 Hyoscyamus Poison of the cobra, apparently accelerates the move- 

 ments 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 phos- 

 phate of ammonia Alcohol innocuous, its vapour narcotic and poison- 

 ous Chloroform, sulphuric and nitric ether, their stimulant, poison- 

 ous, and narcotic power Carbonic acid narcotic, not quickly poisonous 

 Concluding remarks 162-186 



CHAPTER X. 



Oh the Sensitiveness op the Leaves, and on the Lines of 

 Transmission of the Motor Impulse. 



Glands and summitB of the tentacles alone sensitive Transmission 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 dis- 

 charge of the motor impulse suqden 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 . 187-212 



CHAPTER XI. 



Recapitulation of the Chief Observations on Drosera rotun- 

 difolia 213-225 



