344 : A. LIVERSIDGE. 
Before proceeding with further determinations of gold in sea- 
water, experiments were made to ascertain what loss of gold was 
sustained in the case of solutions containing known quantities of 
gold. . 
EXPERIMENTS witH DistILLED Water AND ADDED GOLD. 
The following experiments were made to ascertain whether 
small quantities of gold in dilute solution could be recovered by 
treatment with ferrous sulphate and other reagents. After adding 
the ferrous sulphate the solution was exposed in large new shallow 
photographer's developing dishes for some days, so that the ferrous 
sulphate might be slowly oxidised and precipitated ; in some cases 
glass cylinders were used and air blown through the solution. To 
' complete the precipitation ammonia was added, the precipitate 
collected, washed, dried, scorified, and cupelled. 
From the following results it will be seen that there was but 
little loss in some cases, but a good deal in others, partly due to 
imperfect precipitation by the ferrous sulphate, and partly to the 
loss during cupellation. In most cases the treatment with ferrous 
sulphate, oxidation and precipitation was 2 upon the filtrate 
from the first precipitate. 
1000 ce. distilled water and 1 cc. of 01% AuCl, solution = 
“00154 grains gold. ; 
(1) Treated with -5 gram. FeSO, and NH, yielded 0015 gt. 
(2) Filtrate treated with -25 gram. FeSO,& NH, ,, ‘0000 » 
Gold = 0015 , 
1000 ce. distilled water (containing 30 grammes NaCl) and | &. 
of 01% AuCl, solution = -0015 grain of gold. 
(1) Treated with -5 gram. FeSO, and NH, yielded ‘0011 gt 
(2) Filtrate treated with -25 gram. FeSO,&NH, ,, ‘0000 » 
Gold = ‘0011 » 
4.¢., a loss of -0004 grain gold or 266% The presence of the 
N aCl Seems to increase the loss of gold. 
