133 
1890-91.] Mr J. Y. Buchanan on Deep-Sect Deposits. 
once all the portions of any one sample which will be required for 
the various determinations which are to he made, in order to be 
certain that a uniform material is used for each. This is attended 
with much inconvenience, which is obviated by preserving the 
sample in such a way that it will he unlikely to alter, and by keep- 
ing strict account of its weight, so as at once to detect any alter- 
ation which may occur. 
Table III. — Determination of Loss on Ignition , , and of the Water 
ancl Carbonic Acid expelled thereby. 
No. of 
Sample. 
Weight oJ 
Before 
Heating 
(grammes) 
l Sample. 
After 
Heating 
(grammes) 
Loss 
(grammes) 
Per cent, 
of 
Loss. 
Weight of 
Water 
absorbed 
by CaCl 2 
(grammes) 
Per cent, 
of 
h 2 o. 
Weight 
of C0 2 
absorbed 
by Soda- 
lime 
(grammes) 
Per cent, 
of C0 2 . 
| i = if 4 -h — d 
\ 
b 
c=a-b 
c 1 
d=m- 
e 
/ =1 < 
g 
h = 100-2 
a 
i 
31 
0-8180 
0-7905 
0-0275 
3-36 
0-0327 
3-99 
0-0086 , 
1-05 
1-68 
32 
0-7114 
0-6873 
0-0241 
3-38 1 
0-0200 
2-81 
0*0125 
1-75 
1-18 
35 
0-8978 
0-8670 
0-0308 
3-38 1 
0-0200 
2-22 
0-0240 
1 2-67 
1-51 
36 
0-7337 
0-7068 
0-0269 
3-66 
0-0242 
3-29 
0-0120 
1-63 
1-26 
39 
0-6940 
0-6702 
0-0238 
3-42 
0-0205 
2-75 
0-0007 
o-io 
- 0-57 
41 
1-0103 
0-9724 
0-0379 
3-75 
0-0322 
3-18 
o-oooo 
o-oo 
-0-57 
43 
0-7640 
0-7363 
| 0-0277 
3-62 
0-0252 
3-29 
0-0041 
0-53 
0-20 
45 
0-4669 
0-4539 
0-0130 
2-90 
0-0168 
3-59 
0-0083 
1-77 
2-46 
46 
0-5529 
0-5317 
0-0212 
3-83 
i 0-0156 
3-00 
0-0088 
1-59 
0-76 
64 
0-5160 
0-4598 
0-0562 
10-89 
0-0451 
8-74 
0-0084 
1-62 
- 0-53 
65 
0-6972 
0-6551 
! 0-0421 
6-03 
0-0364 
5-22 
0-0090 
1-29 
0-48 
86 
0-7951 
0-7500 
1 0-0451 
5-67 
0-0301 
5-68 
0-0182 
2-29 
2-30 
87 
0-7999 
0-7442 
0-0557 
6-96 
0-0236 
2-95 
0-0300 
3-75 
-0-26 
88 
0-6339 
0-6071 
0-0268 
4-22 
0-0207 
3-26 
0-0137 
2-16 
1-20 
89 
0-6010 
0-5663 
0-0347 
1 
5-77 
1 0-0220 
3-66 
1 
0-0065 
1-08 
-1-03 
Table III. Determincdion of the Moisture , Carbonic Acid , dncl 
Total Loss . — A quantity of the substance was weighed into a 
porcelain boat, placed in a combustion tube, and heated strongly 
in a current of air freed from moisture and carbonic acid by 
passing it through a tube filled with soda-lime and another filled 
with calcium chloride. The water was collected in a calcium 
chloride tube, and the carbonic acid in a soda-lime tube, and 
weighed. The boat was again weighed after the heating, and the 
difference in weight is called total loss. In every case the mud was 
of a reddish colour after heating. It will be observed that in all 
cases the loss of weight of the substance is different from the gain 
