used for Agricultural Purposes. 
423 
more valuable than, Suffolk or Bedfordshire coprolites of an 
equal percentage of phosphate of lime, but more largely con- 
taminated with oxide of iron and alumina. 
For commercial purposes full analyses are not required, and 
from a large number of such analyses I select a few in illustra- 
tion of the extent of variation which actually occurs in this 
description of phosphate. 
Composition op Williman's Island Phosphate (South Carolina 
Phosphate). 
No. 
1. 
No. 2. 
4 
32 
313 
24 
63 
24-85 
37 
43 
37 01 
Oxide of iron and alumina, carbonic acid, &c. 
15 
33 
17-76 
18 
29 
17-26 
100 
00 
100-00 
53 
77 
54-25 
Composition of South Carolina Land Phosphates. 
)___ 
No 
1. 
No 
2. 
No 
3. 
No 
4. 
No 
.5. 
No 
6. 
No. 
7. 
ter of combination . . . . / 
7 
40 
2 
29 
10 
30 
3 
98 
01 
{? 
59 
09 
7 
1 
69 
34 
26 
50 
24 
29 
22 
06 
25 
tl 
23 
93 
24 
80 
23 
35 
37 
20 
38 
71 
37 
24 
40 
36 
75 
38 
84 
36 
41 
ide of iron and alumina,! 
lugnesia, carbonic acid, &c./ 
16 
27 
17 
28 
15 
45 
18 
82 
16 
88 
17 
01 
16 
54 
oluble siliceous matter .. 
12 
63 
17 
43 
14 
95 
11 
62 
14 
43 
11 
67 
14 
67 
100 
00 
100 
00 
100 
00 
100 
00 
100 
00 
100 
00 
100 
00 
Equal to tribasic plios-'l 
phate of lime . . . . / 
57 
85 
53 
02 
48 
16 
55 
60 
52 
24 
54 
14 
50 
9« 
I It will be seen that the composition of Charleston land phos- 
phate varies to some extent ; the deficiency of phosphate of 
lime in some samples is principally due either to an excess of 
water in the cargo, or to the phosphate not having been washed 
with sufficient care, whereby it has not been deprived as much 
IS possible from adhering sand. 
