12 
It can be seen that no one constituent showed any regular varia- 
tion with any one other constituent in all the samples. The amount 
of citrate-soluble phosphoric acid did not show any correspondence 
with the amount of nitrogen, potash, sulphates, lime, iron, or alumina. 
All constituents varied greatly in the different samples except mag- 
nesia, which was uniformly low, and potash, which was practically 
negligible in all except the two samples of fresh bat manure. Sample 
No. 263 contained 15.68 per cent of carbonate of lime, this being the 
only sample with an appreciable amount of carbonate. 
PARTIAL ANALYSES OF SAMPLES TAKEN IN SURVEY OF 
DEPOSITS. 
The samples taken in the course of the survey of the different 
deposits were, as a rule, analyzed only for total nitrogen and the 
various forms of phosphoric acid. When from a preliminary exami- 
nation it seemed worth while nitric and ammoniacal nitrogen were 
determined. 1 Descriptions of the different samples and the re- 
sults of the partial analyses are given in Table IV. 
Table IV. — Analyses of guanos, with their approximate values. 
Lab- 
ora- 
tory 
No. 
Name or location of 
cave. 
Description. 
Total 
nitro- 
gen 
(N). 
Nitro- 
gen as 
am- 
monia. 
Nitro- 
gen as 
ni- 
trate. 
Total 
phos- 
phoric 
acid. 
(.P2O5). 
Water- 
solu- 
ble 
phos- 
phoric 
acid. 
Ci- 
trate- 
solu- 
ble 
phos- 
phoric 
acid. 
Ap- 
prox- 
imate 
value 
per 
dry 
ton. 
751 
772 
Barrio Monte Grande, 
San German. 
"La Tuna," Barrio La 
Tuna, Cabo Rojo: 
Section A 
Fresh bat manure. . . 
Surface to 2 in 
do 
2 to 14 in... 
P.ct. 
10.81 
2.01 
4.28 
.88 
1.12 
.72 
6.63 
.46 
.23 
9.65 
1.02 
1.25 
.89 
5.91 
.11 
.83 
.51 
.36 
.22 
1.37 
.99 
.72 
.96 
.15 
P.ct. 
2.04 
.09 
.26 
P.ct. 
1.15 
.45 
.59 
P.ct. 
6.51 
8.43 
12.07 
4.20 
3.94 
21.82 
5.33 
16.88 
11.88 
5.21 
17.08 
23.90 
4.89 
6.64 
17.38 
9.44 
13.09 
19.43 
15.99 
24.24 
24.87 
23.29 
21.52 
21.37 
P.ct. 
0.95 
2.10 
.76 
.78 
.29 
.76 
Trace. 
Trace. 
2.39 
.25 
.12 
.89 
.17 
Trace. 
.16 
.24 
.23 
.29 
.24 
.26 
.17 
.20 

P.ct. 
5.45 
3.43 
5.74 
2.08 
1.01 
5.43 
2.11 
3.16 
3.16 
4.18 
5.83 
11.06 
2.19 
1.04 
3.48 
2.25 
1.95 
2.55 
1.29 
5.53 
6.90 
4.56 
1.75 

$26.89 
7.13 
773 
774 
Do 
Do 
13.35 
3.84 
775 
Do 
14 to 26 in 
3.25 
776 
Section B 
3 to 14 in. 
6.87 
777 
Section C 
Surface to lin 
1 to 12 in 
.44 
.42 
11.55 
778 
Do 
4.08 
779 
Do 
12tol8in... 
3.62 
780 
Section D 
Surface to 3 in 
Surface to 12 in. 
(sides). 
12 to 36 in. (sides) . . . 
Mixture of 772, 774, 
and 775. 
2 to 38 in 
.42 
3.81 
27.69 
783 
Do 
7.87 
784 
Do 
10.87 
785 
Section A 
3.69 
786 
Do 
.02 
.35 
7.45 
787 
Cabo Rojo 
First 3 ft. of deposit. 
First 8 in 
3.48 
788 
" Los Chorros," Barrio 
Cotui, San German: 
Section C 
3.91 
789 
Do 
Second 8 in 
2.97 
790 
Do 
Third 12 in... 
1.50 
791 
Do 
Fourth 8 in . . . 
1.73 
792 
Section A 
First 9 in... 
8.27 
793 
Do 
Second 12in 
Third 14 in. .... 
10.68 
794 
Do 
6.00 
795 
Section B 
4 to 18 in 
3.67 
796 
Section F 
3 to 40 in. (fine ma- 
terial lodged be- 
tween disinte- 
grated stone). 
.51 
1 Nitric and ammoniacal nitrogen were not determined in samples of less than 1.50 per cent total 
nitrogen except in special cases. 
