CONTENTS. 



CHAPTER III. 



AGGREGATION OF THE PROTOPLASM WITHIN THE CELLS OF TUB 



TENTACLES. 



Nature of the contents of the cells before aggregation Various 

 causes which excite aggregation The process commences 

 within the glands and travels down the tentacles Descrip- 

 tion of the aggregated masses and of their spontaneous 

 movements Currents of protoplasm along the walls of the 

 cells Action of carbonate of ammonia The granules in 

 the protoplasm which flows along the walls coalesce with the 

 central masses Minuteness of the quantity of carbonate of 

 ammonia causing aggregation Action of other salts of 

 ammonia Of other substances, organic fluids, &c. Of 

 water Of heat Redissolution of the aggregated masses 

 Proximate causes of the aggregation of the protoplasm - 

 Summary and concluding remarks Supplementary observa- 

 tions on aggregation in the roots of plants . . Pages 33-G5 



CHAPTEE IV. 

 THE EFFECTS OF HEAT ON THE LEAVES. 



Nature of the experiments Effects of boiling water Warm 

 water causes rapid inflection Water at a higher tempera- 

 ture does not cause immediate inflection, but does not kill 

 the leaves, as shown by their subsequent re-expansion and 

 by the aggregation of the protoplasm A still higher 

 temperature kills the leaves and coagulates the albuminous 

 contents of the glands 66-75 



CHAPTER V. 



THE EFFECTS OF NON-XITROGENOUS AND NITROGENOUS 

 ORGANIC FLUIDS ON THE LEAVES. 



Non-nitrogen oxis fluids Solutions of gum arabic Sugar - 

 Starch Diluted alcohol Olive oil Infusion and decoc- 

 tion of tea Nitrogenous fluids Milk Urine Liquid 

 albumen Infusion of raw meat Impure mucus Saliva 

 Solution of isinglass Difference in the action of these 

 two sets of fluids Decoction of green peas Decoction 

 and infusion of cabbage Decoction of grass leaves 76-8-1 



