On Bats Guano. 
67 
I did not test the preceding samples for nitrates, as I was 
not acquainted, at the time when I made the examination, 
Avith the fact that Bats' guano always contains more or less 
nitric acid. However, about eighteen months ago I received for 
analysis another sample of Bats' guano from the south of Spain, 
the nitric acid in which I determined, and also separately the 
proportions of soluble and insoluble phosphoric acid. 
Like the preceding samples from Spain, it was a dark-coloured 
voluminous manure, and full of fragments of insects, chiefly 
insect-wings, which evidently had passed away with the bats'- 
dung undigested. 
It had the following composition : — 
Moisture 18-32 
*Organic matter and salts of ammonia 53*47 
fPliosphoric acid, soluble in water ; 1"08 
jPhosphoric iicid, insoluble in water 4 '33 
Lime 3-52 
§Nitric acid , 6 '07 
Magnesia and alkalies (not determined) .. .. 2 '06 
Insoluble siliceous matter 11 'IS 
100-00 
* Containing nitrogen 7 ■ 34 
Equal to ammonia 8-91 
+ Equal to tribasic phosphate of lime . . . . 2-35 
I J? .... 9*45 
§ Containing nitrogen 1-57 
Equal to ammonia 1 •90 
Total niti-ogen 8-91 
Equal to ammonia 10 • 81 
It will be seen that this is a very valuable artificial manure, 
as it contains an amount of nitrogen which is equal to nearly 
11 per cent, of ammonia, in addition to which it contains 
appreciable quantites of soluble and insoluble phosphates. 
Bats' Guano feom Jamaica. 
Only one sample of Bats' guano from Jamaica has been 
brought under my notice. This was a brown-coloured rather 
heavy powder, resembling in appearance Baker Island guano. 
On analysis it yielded the following results : — 
Moistm-e 23-07 
*Organic matter and salts of ammonia 23-65 
Phosphate oflime 34 -4^ 
Sulphate of lime 4-95 
Oxide of iron and alumina 5-64 
Alkaline salts 2-22 
Insoluble siliceous matter 5-98 
100-00 
Containing nitrogen '.. 1-26 
Equal to ammonia 1-53 
F 2 
