THE VEGETABLE KINGDOM. 



431 



contact with this side was covered with the secretion. I 

 succeeded still better, and iiuxke the experiment more 

 scientific by using a leaf of the Indian chestnut attached 

 to its branch, and sucking up the water into a vase at 

 hand in proportion as it transpires. All the under surface 

 of the leaf is speedily covered with little drops of water 



233. Transpiration of Leaves. Knight's experiment as modified in the Amphitheatre of 



Koueu. 



visible to the eye, and which obscure the glass it is m 

 contact with, whilst that to which the other surface is 

 applied barely shows traces of vapour. 



55 



