Se NER on ee Sa aN Ret ae RS ER Pe a Pn eae eee eee ee 
E. W. Hilgard—Flocculation of Particles. 207 
4, The presence of alcohol, ether, and of caustic or carbona- 
ted alkales, materially diminishes the tendency to flocculation ; 
while the presence of acids and neutral salts seems to in- 
culative tendency of sediments suspended in them. Just what 
this relation is, must be determined by farther experiment; 
nor will I undertake to discuss at this time what is the precise 
nature of the attraction that causes the formation of these 
between plane plates, even when submerged, as compared wit 
that of, e. g., two watch glasses adhering only by their wetted 
edges, with two concentric circles of menisci. A , it is 
comes possible by the removal of the general liquid mass. 
uppose one of the floccules to be “ stranded,” it will in the 
