Warwick.] l\2i [Nov. 6, 



III. INFLUENCE OF POLE SEPARATION UPON THE PRECIPITATION OF 



CADMIUM. 



Cadmium Cadmium TT n OH gas per Separation of 



present. deposited. minute. electrodes. 



Grams. Grams. c c. c.c. cm. 



(1) .0994 .... 700 2.2 1.58 



(2) " .0059 " 1.25 



(3) " .0023 " .8 



(4) " .0009 " " 3.16 



(5) " .0002 " " 6.33 



(6) " " " 12.66 



Although 20 c.c. of free formic acid was present in (1) and (2) both 

 were failures, the latter, though it was weighed, being merely approxi- 

 mate, some particles having been washed off. The current was then 

 reduced to .8 c.c. HO gas per minute. Adherent deposits were obtained, 

 but in such small quantity that (5) yielded only a trace. The ratio of 

 diminution was (3-4) .0014 grams, (4-5) .0007 grams. Area of electrodes 

 (3.8 cm. X S.48 cm.) X 2, time 1 hour, free acid present 10 c.c. 



I. INFLUENCE OF DILUTION UPON THE PRECIPITATION OF ZINC. 



Zinc Zinc TT o Free OH gas per 



present. deposited. acid. minute. 



Grams. Grams. c.c. c.c. c.c. 



(1) .1250 .0300 100 .5 1.75 



(2) .0625 .0155 " .25 



(3) .1250 .0173 " 5. 



(4) .0625 .0083 " f 



(5) .0313 .0043 " f 



(6) .0156 .0028 " f 



(1), (2), (5) and (6) were spongy, especially the last. Distance between 

 the poles 3.16 cm. Area (2.85 cm. x 3.8 cm.) X 2, time one hour. 



II. INFLUENCE OF TEMPERATURE UPON THE PRECIPITATION OF ZINC. 



Zinc Zinc TT o Free OH gas per Temperature in 



taken. deposited. acid. minute. degrees Cent. 



Grams. Grams. c.c. c.c. c.c. 



(1) .1539 .... X50 10 .3 200 



(2) .1026 .0145 " " 1.8 



(3) .1026 .... " " " 400 



(4) .0205 .... " none .3 20 



(5) " .... " .8 



(6) " .... " " 1.3 



(7) .0513 .0029 145 5 .9 



(8) " .0019 " " " 400 



(9) " .0010 " " " 600 



(10) " .... " " . " 80 



(11) " 



(12) " .... " none 



