﻿Colloids produced b>j Electric Endosmose. 



555 



separated by a neutral zone from a positive outer zone. The 

 figure was drawn after the current had been passing for an 

 hour between electrodes at a potential-difference of 16 volts. 

 In Table III. is given the mean diameter of the furrow 

 round the anode at various times, for the case of a cube of 

 gelatine ; also the square of the diameter divided by the 

 time. The means of the values in the third column 

 divided by the voltage give approximately the same number ; 

 thus the places of greatest double refraction form spherical 

 surfaces, the square of the diameter of which is proportional 

 to the time and to the voltage. 



Table III. 



T = Time from completion of electric circuit. 

 2r = Diameter in mm. of the ring round the anode. 



5-6 Volts. 



1.") Volts. 



24 Volt 



a. 



34 Vults. 



T. 2r. 



(2r) 2 /T. 



T. 



2/-. 



(2./- T. 



T. 2,-. 



(2r - T. 



T. 



2/\ 



. »/T. 



0' 0" 





0' 0" 







0' 0" o 





0' 0" 









3 5 2-9 



2-7 



3 



4-7 74 



3 30 6-0 



10 3 



1 50 



4-> 



1 2-5 



5 30 3-4 



33 



7 20 



7-3 7-3 



9 9-5 



100 



2 3i> 



•'.•7 



180 



8 30 42 



21 



13 10 



10.4 8-2 



15 13 



11-3 



5 m 



101 



19-1 



■ 11 15 4-8 



2 



17 20 



11-7 



7-9 



21 15-U 



J 02 



11 15 



14(1 



17-4 



18 30 6-5 



23 



2 1 45 



13-o 



7-8 



28 30 18-5 



1 20 



14 



15-7 



176 



2.3 7-2 



21 



27 50 



14fi 



77 



34 o 195 



112 



18 15 



17-5 



168 



31 79 



2-1 



34 1 5 



160 



7 5 



4G 30 22 



104 



22 15 



19-1 



16-8 



37 30 8-5 



1-9 



41 oo 



17-4 



72 







30 



21-5 



15-4 



42 () 93 



24 









i 











48 107 



23 



















((2^T) = 2-3 



i 



((2r) 2 /T)=7-6 



((2r) 2 /T = 



10-8 



k '(2r) 2 /T)=17"2 



(2r)7TV=041 



(2r)7TV = 0ol 



(2r) 2 IT = 



45 



■2 - IT= 51 



Gelatine Solution. 



One per cent, gelatine solution covered the bottom of a 

 shallow glass dish to a depth of 1 mm. Two vertical pla- 

 tinum wires 5 cms. apart were connected to a battery of 

 40 volts. At the anode a white cloud spread outwards; 

 behind the solution had jellied through loss of water or gain 

 in gelatine ; on its surface lines running perpendicular to 

 the direction of the current were to be seen ; these moved 

 forward from time to time with a sudden, undulatory move- 

 ment. If the solution through evaporation had grown thick 

 crystals could be watched forming as before round the 

 cathode ; if the solution were still liquid, they were driven 



