LLOYD: COLLOIDAL SYSTEMS 563 



and other reagents (acids and alkalis). This and other behaviors^ 

 preclude a contributing role of water vacuoles, while they indicate 

 strongly the value of the suggestion that the hydratation effects 

 alter the permeabilities of the protoplasm, which themselves can 

 be momentarily altered. Thus, the amount of water already in 

 the protoplasm affects the hydra tating power of a given reagent, 

 as shown by pollen with different initial quanta of water (im- 

 bibed). It is hoped that this brief report will serve to indicate 

 the importance of directing research toward the behavior of 

 the congeries of colloids constituting protoplasm as such, as dis- 

 tinguished from systems in which complications arise from such 

 disturbing factors as water- vacuoles, mucilages, etc., without 

 however underrating the importance of understanding the inter- 

 relations of these and the protoplasm. 



1 Swellings and coagulation effects caused by acids and alkalis and the characteristic 

 forms so produced; change in size of dispersoids, as in the case of oil. 



