the state of dispersion of the colloid particles, and until 



the factors which may influence this, mei 



of colloids can scarcely I"- of yerj much value 



property has Bome physiologic bearing 



loids have in restoring the blood pre« ill . 



Further e\ idence thai i be osmol i<- pr< 

 significance thai it has in the case of molecular boIuI 



the Pad thai tl Bmotic pressure is only approxin oal 



to the concentration «>t' the Bolution; it may either ii 



relatively to the Btrength of the solution. Temp< 



a differenl influence on the osmotic pressure Loids I that wl 



it has "ii the osmotic pressure of molecular Boluti< atly 



has an influence which persists after the solution is ; 



original level. 



The influei of added Bubstances on the osmotic ]» 



solutions is of considerable interesl to the biol 



ease of molecular solutions this is purely additive, in I 



loids ili>' added substance may al one time cause the osmoti 



increase, a1 another, to decrease. It lias been found that th< 



pressure of gelatin solutions at firsl d< then rapidly inc 



the H-ion concentration is raised. The addition of alkali inci 



osmotic pressure until a maximum is reached, beyond whicl 



fall. Both ac'nN and alkalies lessen the osmotic pr< bu- 



miii. Electrolytes always decrease the osmotic pi 



albumin solutions, and the dej to which the; 



depends on the uature of the cation and anion con 



In the order of their depressing influence tl • 



sri\ es: 



Eeavy metals > alkaline earths > alkalies 

 and the anions: 



SO > CI • NO Br I 



The influence of a given electrolj te vi 

 tion of the colloid, a fad which mu- 

 ni this field. 



