used for Agricultural Purposes. 429 
Composition of St. Martin's Phosphates. 
No. 1. 
No. 2. 
1 
No. 3. No. 4. 
No. 5. 
No. 6. 
1 - 
Moistlue and water of combi-"! 
Oxide of irou and alumina, &c. 
Insoluble siliceous matter . . 
* Equal to tribasic jihos-'l 
phate of lime . . . . / 
t E(iual to carbonate of lime 
5-50 
36-04 
48-87 
2-89 
4-78 
1 • AO 
1 0.J 
5-15 
35-69 
46-04 
2-65 
7-93 
4- 01 
35-22 
50-15 
5- 79 
4-59 
-24 
2-94 
31-18 
53-48 
10-73 
1-14 
•53 
2- 26 
28-38 
52-52 
13-04 
3- 60 
5-69 
16-67 
40-88 
20-60 
11-97 
100-00 
100-00 
100-00 
100-00 
100-00 
100-00 
80-64 
6'57 
77-91 
602 
76-88 
13-15 
68^07 
24-39 
61-95 
29-63 
36-39 
46-81 
The samples No. 1 and No. 2, it will be seen, contained but 
ittle carbonate of lime, and a high percentage of phosphate of 
ime. No. 3 contained more carbonate of lime, but was rich in 
ihosphate of lime, and must be considered a high-class phos- 
phate. In No. 4 the proportion of carbonate of lime rose to 
34 per cent., and that of phosphate of lime receded to 68 per 
•ent. Although rather too much contaminated with carbonate 
)f lime, it was still of a quality which finds a ready sale in 
England. No. 5, on the other hand, was of too poor a quality to 
oear the expense of freight, and No. 6 was practically useless and 
insaleable in this country, as it contained a higher percentage of 
carbonate than phosphate of lime. 
The following are more complete analyses of two samples of 
St. Martin's phosphate : — 
Detailed Composition of Two Samples or St. Martin's 
Phosphate. 
No. 1. 
No. 2. 
5 
04 
3-56 
24 
14 
35-13 
47 
69 
50-41 
38 
•22 
18 
•45 
14 
20 
6^59 
1 
51 
1^40 
Alumina 
2 
99 
1-37 
3 
87 
-87 
100 
00 
100-00 
52 
70 
76-69 
32 
•27 
14-98 
