On Bats* Guano. 71 
Moisture 11 "39 
'Organic matter and salts of ammonia 16 '45 
Phosphoric acid, soluble in water "76 
Phosphoric acid, insoluble in water 7 '88 
Lime 12-32 
Magnesia 3 '83 
Oxide of iron and alumina 4 • 33 
Sulphuric acid 14*27 
Nitric acid *35 
Carbonic acid 1'04 
Chloride of potassium 10 '16 
Chloride of sodium 8 " 62 
Insoluble siliceous matter 8 • 60 
100-00 
* Containing nitrogen 2 • 64 
Equal to ammonia 3 • 20 
Combining these constituents together, the composition of 
this guano may be represented as follows : — 
Moisture 11-39 
*Sulphate of ammonia 8-05 
•fOrganic matter 13-28 
Monobasic phosphate of lime 1 "05 
Equal to tribasic phosphate of lime rendered) /-i.c^n 
soluble ) ^ 
Tribasic phosphate of lime 13-84 
Tribasic phosphate of magnesia 2-84 
Sulphate of magnesia 7-59 
Carbonate of lime 2*36 
{Nitrate of lime -53 
Sulphate of lime , 7-36 
Chloride of potassium, equal to 6 ■ 39 of potash .. 10-16 
Chloride of sodium 8-62 
Oxide of iron and alumina 4-33 
Insoluble siliceous matter 8 • 60 
100-00 
* Containing nitrogen 1-70 
Equal to ammonia 2 • 06 
t Containing nitrogen -94 
Equal to atnmonia 1-14 
J Containing nitrogen -09 
Equal to ammonia -11 
Total nitrogen 2-73 
Equal to ammonia 3 • 31 
This guano, it will be noticed, has a very complex compo- 
sition, and differs principally from the generality of samples 
recently analysed by me in containing large proportions of 
chloride of potassium and sodium, which somewhat depress the 
average percentage of phosphate of lime, amounting in most 
cargoes to about 60 per cent., and rising in some to upwards of 
