between the individual cells is destroyed by the consumption of 

 water in the growing cells, the water from the more distant 

 portions of the tissue is absorbed to restore it. The growing 

 cells contain dense protoplasm and need much water, the older 

 parts contain less dense protoplasm and much cell-sap, and the 

 still older parts only cell-sap. 



In conclusion, I must thank you for the attention which you 

 have given me while I have endeavoured to treat this intricate 

 and difficult subject in as plain a manner as I could think of, 

 and I trust that in some respects at least I have not left unful- 

 filled the task I had set myself, viz., to give some account of 

 the mechanism whereby the movements of fluids in plants is 

 determined. My thanks are also due to my friend W. Gardi- 

 ner, B.A., for valuable information concerning his researches 

 on water glands and water pores, without which this essay 

 would have been necessarily incomplete. 



[The paper was illustrated by diagrams and drawings of 

 some of the various parts of plant structure noticed during its 

 progress.] 



