1905.] Crystalloids and Colloids through Gelatine. 321 



by adding ammonium carbonate to ferric chloride and dialysing for three 

 weeks ; it gave no trace of red coloration with potassium thiocyanate, but 

 showed the characteristic reaction of colloidal ferric hydrate, viz., a slight 

 yellowish precipitate. The filter used contained 11 per cent, gelatine which 

 had been dialysed for 24 hours. The content of the fractions of filtrate, etc., 

 in iron, was determined by converting the hydrate into chloride and 

 estimating colorimetrically with potassium thiocyanate. 



Table II. 



Colloidal ferric hydrate. 



Neutral red. 



Iodine in potassium iodide. 





Vol. in 

 c.c. 



Pres- 

 sure in 



Per- 

 centage 



Vol. in 

 c.c. 



Pres- 

 sure in 



Per- 

 centage 



Vol. in 

 c.c. 



Pres- 

 sure in 



Per- 

 centage 



Per- 

 centage 





atmos. 



Jb e. 



atmos. 



AT T? 



atmos. 



T 



h- 



"ITT 





4 



100 



o-o 



4 



100 



o-o 



1 



100 



5 



68 -8 





4 



100 



0-7 



4 



100 



2-3 



4 



100 



8 



69 -9 



6 



4 



100 



- 6 



4 



100 



n -rid. 





100 



j. / 



ICi -Q 

 i\J u 



H 



4 



100 



0-4 



3 



20 



0-03 



4 



100 



19 



69 -9 



if fill 



4 



100 



0-4 



10 



100 



0-30 



4 



100 



21 



69-9 



4 



100 



0-4 



10 



100 



0-78 



4 



100 



23 



69-9 



00 



4 



100 



0-1 



10 



100 



0-90 



4 



100 



25 



68 -3 



CI 



_o 



4 



100 



o-o 



10 



100 



1-17 



1 



15 



20 



69 -9 



o 



4 



100 



o-o 



10 



100 



3-00 



5 



100 



33 



71 -5 



03 

 S 



1 



100 



o-o 



10 



100 



3-20 



5 



100 



33 



73 -0 



ive f 



0-5 



20 



250 -0 



20 



100 



4-68 



4 



100 



35 



72 -0 



1 



100 



4-75 









0-75 











43 -0 



ccesa 



2 



100 



0-9 









0-75 



100 



25 



93 -5 



3 



50 



0-7 









6 



100 



37 



90 -5 





0-5 



15 



66 -6 









6 



100 



50 



86 -0 



0-75 



50 



1 -o 









1 







1 



34 -4 





0-25 



30 



0-6 









5 



10 



25 



94-6 





0-5 



20 



3 









2 



100 



30 



92 -5 





0-75 



10 



0-1 









3 



50 



30 



96 -8 





0-25 



50 



0-2 









4 



100 



30 



91 -4 





1 



100 



0-2 









5 



50 



30 



85 -0 





5 



15 



0-4 









5 



25 



30 



82 -8 





4 



100 



0-4 









5 



25 



25 



79 -5 





0-5 



15 



0-4 









5 



25 



25 



73 -1 





4 



100 



0-4 



■ 















Res. 



50 





180-0 



20 





18 -75 



35 





30 



109 7 



Orig. 



120 





100-0 



120 





100-0 



120 





100 



100-0 



Examination for Ferric Hydrate. — Table II gives the relations obtained in 

 one out of three similar experiments. 



Original Fluid : Five per cent, ferric hydrate = (100) Fe. 



Filtrates : The 1st and 2nd fractions contained (0 - 0) and (07) respectively, 

 and in the succeeding fractions the amount diminished until in the 8th no 



