SEPARATION OF COLLOIDS FROM CRYSTALLOIDS BY FILTRATION. 149 
Albumens 
Globulins 
; Fibrinogen 
deoaige ta Nucleo-albumens 
Hemoglobin 
Caseinogen 
Carbohydrates... sei aos were ‘ 
Soluble starch (Amyl.-dextrin) 
Heematin 
Colouring Matters | Serum pigment 
Egg-white pigment 
Albumoses and peptones pass through the filter. Crystalloids 
pass through and at the same rate as water, for a solution of glucose 
or salt neither gains nor loses in concentration by filtration. 
The method I have found of service in some physiological 
enquiries. If blood is placed outside the filter, the solution 
coming through is rid of all albuminous and colouring bodies. It 
is clear, colourless, and contains the glucose salts, urea etc., in a 
condition favourable for quantitative analysis. 
For solutions of crystalloids I believe the process to be one of © 
true filtration and in no way connected with the phenomena of 
molecular diffusion. The molecules of albumen and other proteids 
are unable, probably on account of their size, to pass through the 
pores of the jelly. 
