TIIE VOYAGE OF H.M.S. CHALLENGER. 
242 
This chloride of silver, then, in order to remove from it every trace of moisture, was 
heated to 1 50° C. in the current of dry air, when the following weighings were obtained : — 
Tube and boat and AgCl, 
Do. do. 
Do. do. 
Mean, 
1 = 39-7357 grams. 
2 = 39-7359 ,, 
3 = 39-7361 „ 
= 39-7359 
Chloride of silver dried at 150° C., 
2-8286 
This chloride of silver was next fused repeatedly in a current of dry air, the operation 
in each case being continued for about 20 minutes, and again weighed. 
Tube and boat and AgCl fused in air, 
Do. 
do. 
Do. 
do. 
Do. 
do. 
Do. 
do. 
N uni ber adopted, 
Chloride of silver fused in air, 
1 = 39"7352 grams. 
2 = 39-7354 „ 
3 = 39-7354 „ 
4 = 39-7354 „ 
5 = 39-7354 „ 
= 39-7354 „ 
= 2-8281 , 
d'h is fused chloride of silver was then again fused in a current of dry chlorine, and 
the exposure to this gas continued for about 20 minutes, the chlorine displaced by a quick 
■ urrent of dry air, of just sufficient duration to clear the atmosphere of the apparatus, 
allowed to cool, and weighed. After chlorination in this way, the chloride of silver was 
next fused, and kept in that state for about 25 minutes, in a current of dry air, allowed 
to cool, and weighed. The weighings obtained after heating alternately, first in chlorine 
followed by a little air, and then in a long lasting current of air, were as follows : — 
Tube and boat and AgCl fused in chlorine, 
1 = 39-7349 grams. 
Do. do. in air, 
1 = 39-7350 „ 
Do. do. in chlorine, 
2 = 39-7354 „ 
Do. do. in air, 
2 = 39-7353 „ 
Do. do. in chlorine, 
3 = 39-7354 „ 
Do. do. in air, 
3 = 39-7356 ,. 
Mean weight of AgCl after heating in chlorine, . 
= 2-8279 „ 
And then in air, ..... 
= 2-8280 „ 
Another experiment gave similar results, as seen by the following summary : — 
Exp. I. Exp. II. 
Chloride of silver, as taken from bottle (i.e., dried at 150° 
C.), 2-8285 
3-1683 grams 
After heating in a current of air at 150* C., . 
2-8286 
3T687 „ 
After fusion in a current of dry air, . 
2-8281 
3-1682 „ 
After fusion in dry chlorine. 
2-8279 
3-1681 „ 
After prolonged fusion in current of dry air, 
2-8280 
3-1680 „ 
