1905.] Crystalloids and Colloids through Gelatine. 325 



the same. On filtering horse serum in full strength, however, the decrement 

 in rate was found to be abnormally large. 



Table III. 



100 atmos. 12° C. 



NaCl. 



KI, 

 I. 



NaCl 

 lysin. 



NaCl 

 toluol. 



NaCl 

 Am. Ale. 



NaCl 

 HBu. 



Dist. 

 water. 



Coll. 

 Fe(HO) 3 . 



Serum. 



Initial drops per 



7 



7 



8 



16 



18 



6 



9 



6 



6 



minute 





















Final drops per 



4 



4 



5 



18 



60 



IS 



4 



4 



1 



minute 





















A solution of 08 per cent, saline containing toluol as a fine emulsion did 

 not show any decrement. 



On the other hand, 08 per cent, saline containing either amylic alcohol or 

 butyric acid (4 - 8 per cent.) gave very distinct increments in the rate of 

 filtration. 



Table IV gives a comparison of the rates obtained for distilled water and 081 

 per cent, sodium chloride containing 4 - 8 per cent, of butyric acid. It is evident 

 that distilled water filters more and more slowly, whereas the saline butyric 

 acid passes more and more rapidly. The effect of removing the pressure for 

 two minutes enables the distilled water on re-establishing the pressure to pass 

 through at a higher rate, and if the pressure be removed for 10 minutes the 

 gelatine regains completely its original rate of filtration. 



Table IV. 



Distilled water. 



Sodium chloride and butyric 



acid. 



Pressure 



Time in 



Drops per 



C.c. per 



Pressure 



Time in 



Drops per 



C.c. per 



in atmos. 



minutes. 



minute. 



minute. 



in atmos. 



minutes. 



minute. 



minute. 



100 







7 





100 







6 





100 



13 



6 



0-5 



100 



2 



5 





100 



21 



5 



0-5 



100 



5 



9-5 









23 









100 



7 



11 



0-7 



100 



29 



6-5 



0-6 



95 



15 



9 75 



0-6 



100 



32 



5 



0-5 



90 



20 



9 





100 



40 



4-5 



0-3 



100 



23 



11 



0-6 







50 









100 



35 



13 



0-6 



100 



73 



9 



0-7 



100 



42 



14 



0-7 



100 



83 



5-5 



0-5 



100 



49 



15 



0-7 



100 



133 



4-5 



0-4 



100 



64 



16 



0-8 











100 



71 



18 



0-9 











100 



74 



18 



11 



