66 
On Bats' Guano. 
nitrate of soda, and containing 2*52 per cent, of nitrogen, 
equal to 3'06 of ammonia. The total nitrogen in No. 4 thus 
amounted to 7"89 per cent., equal to 9'58 per cent, of ammonia; 
and the phosphoric acid in this sample was equal to 18 per cent, 
of tribasic phosphate of lime. A manure, equal to the Bats' 
guano No. 4, would be worth about 111. a ton. 
Bats' Guano from the South of Spain. 
As early as 1870 a peculiar kind of guano was sent to me 
for examination, which, having been found in caves in Spain, 
was called Cave-guano. It was a wet, dark-coloured, porous 
material, having but little smell, and was full of fragments of 
insects. I readily recognised it as Bats' guano. 
On analysis it yielded the following results : — 
Moisture 33-68 
*Organic matter and salts of ammonia 25-16 
Phosphate of lime 7 • 48 
Sulphate of lime, &c 1-18 
Insoluble siliceous matter 32-50 
100-00 
Containing nitrogen 3-36 
Equal to ammonia 4-08 
Two years afterwards, two more samples of bats'-dung found 
in the south of Spain were examined by me. Both, it will be seen 
by the subjoined analyses, were superior to the one the analysis 
of which has just been quoted. Both were very porous, volu- 
minous, and dark-coloured materials, without any particular smell, 
and both contained innumerable fragments of insects' wings. 
The composition of these two samples was as follows : — 
No. 1. 
No. e. 
♦Organic matter and salts of ammonia 
15-82 
65-08 
3-34 
13-37 
2-39 
18-81 
42-09 
4- 65 
5- 18 
15-28 
13-99' 
100 00 
100-00 
t Equal to tribasic phosphate of lime . . 
I Containing soluble phosphoric acid 
Equal to tribasic phosphate of lime .. 
8-67 
10-52 
3-76 
8-20 
4-96 
602 
10 15 
