01 
The following table represents the above in combination : 
4 
I. 
4090-4 
II. 
5454-3 
1358-9 
700-7 
922-3 
3760 
IVTngnfisiiiTn Sulphate 
670-3 
225-7 
Potassium Sulphate 
70-3 
Sodium Sulphate 
49-9 
47-0 
Dead Sulphate 
1-25 

Calcium Chloride 
16-8 
Sodium Chloride 
19-4 

Sodium Nitrate 
4-8 
- 
Ammonium Nitrate 
7-2 

Aluminium Phosphate 
3-2 

Manganese 
trace 
trace 
Silica 
157-0 
149'0 
Albumenoid Ammonia 
0-34 

Bases for which there is not sufficient Acid 
1 15-5 
1-4 Loss 
7370-79 
6970-9 
With reference to this analysis the following observa- 
tioiivS are to be made : — • 
(1.) The determination of the total residue was first made 
at 180°C., as recommended by Fresenius,^ and the result 
obtained corresponded to 8,100 parts per 1,000,000; it was 
found however that this was much too high, the reason being 
that ferrous sulphate, though it looses six molecules of water 
at 114°C,, yet retains the seventh even at 280f. In order to 
drive off this remaining molecule, the residue from lOOcc of 
water was heated in an air bath to 800°— 310'" and weighed ; 
after repeated heating two successive weighings did not 
differ by more than a milligramme. In heating to so high 
a temperature, however, there is a danger of a little sul- 
phuric acid volatilising by decomposition of the sulphate of 
iron, but by careful heating this may be avoided ; a loss of 
ammonia will, nevertheless, have been incurred, but as this, 
together with the trace of organic matter, did not amount 
to more than 8 to 10 parts per 1,000,000, it was not of very 
much consequence. 
* Fresenius. Quantitative Analysis, 4th Edition, p. 560. 
t Watts, Dictionary of Chemistry, Vol. 5, p. 597. 
