On the Secretion of the Leaves and Stems of the Ice-plant. 3 



cated by the above reactions. They likewise show the presence 

 of chloride of sodium, potash, sulphuric acid and magnesia. 



In comparing this secretion of the leaves of the Ice-plant with 

 the fluid in the ascidia of Nepenthes, we find a material difference 

 in their respective compositions, as will be seen by the annexed 

 table, which exhibits the composition of both fluids : 



Composition of the watery secretion 

 of the leaves of Mesembryanthe- 

 mum crystallinum. 



Organic matter (albumen, oxalic 



acid, &c.). 

 Chloride of sodium. 

 Potash. 

 Magnesia. 

 Sulphuric acid. 



Composition of the fluid in the 

 ascidia of Nepenthes. 



Organic matter, chiefly malic and a 



little citric acid. 

 Chloride of potassium. 

 Soda. 

 Lime. 

 Magnesia. 



