304 
On the Analysis of Guano. 
comes the most valuable of its coustituents, as a source of perennial 
fertility. In the detailed account of my analyses of this complex excre- 
tion (now preparing for publication), all the above statements will be 
brought within the scope of general comprehension. I shall also describe 
my ' ammonia generator,' based on the process invented in the laboratory 
of Professor Liebig, and also my ' ammonia meter,' which, together, can 
detect and measure one-hundredth part of a grain weight of absolute 
ammonia, whether potential or actual, in any sample of guano. 
"Meanwhile the following may be offered as the average result of 
my analyses of genuine guano in reference to its agricultural value ;— 
"1. Azotized animal matter, including urate of am- 
monia, together capable of affording from 8 to 
16 per cent, of ammonia by slow decomposition 
in the soil . . . . . . 50 0 
2. Water 11 0 
3. Phosphate of lime 25 0 
4. Phosphate of ammonia, oxalate of ammonia, am- 
monia — phosphate of magnesia, together contain- 
ing from 5 to 9 parts of ammonia . . . 13 0 
5. Siliceous sand . . . . . .10 
100 O 
" Very moist guano has in general more actual and less potential 
ammonia than the dry guano. 
"Andrew Urk. 
^'London, 13, Charlotte Street, Bedford Square, 
" February I4th, 1843." 
Oellacher's analysis of a brownish yellow guano is as follows : — 
Ammonia. 
1. 
Urate of ammonia . . 
. 12 
20 
1-07 
2. 
Oxalate of ammonia 
. n 
73 
6-50 
3. 
Oxalate of lime 
1 
30 
4. 
Phosphate of ammonia 
6 
00 
1-79 
5. 
Piiosphate of ammonia and magnesia 
. 11 
63 
1-68 
6. 
Phosphate of lime . 
. 20 
16 
1. 
Muriate of ammonia 
2 
25 
0-72 
8. 
Chloride of sodium (common salt) 
0 
40 
9. 
Carbonate of ammonia 
0 
80 
0-23 
10. 
Carbonate of lime . 
1 
65 
11. 
Sulphate of potash . 
4 
00 
12. 
Sulphate of soda 
4 
92 
13. 
Humale of ammonia 
1- 
06 
0-09 
14. 
Substance resembling wax 
0 
•75 
15. 
Sand ...... 
1 
•68 
16. 
Water (hygroscopic) 
4 
31 
n. 
Undefined organic matter . . 
8 
26 
100 
•00 
1207 
I am satisfied from the large proportion of oxalate of ammonia that 
the sample thus analyzed was by no means a fair or normal specimen of 
