265 
appears that all these substances contain consider- 
able quantities of a matter analogous to coagulated 
albumen ; the sponges afford likewise gelatine. 
According to Merat Guillot white coral con- 
tains equal parts of animal matter and carbonate of 
lime : red coral 46.5 of animal matter, and 53.5 of 
carbonate of lime ; articulated coraline 51 of animal 
matter, and 49 of carbonate of lime. 
These substances are, I believe, never used as 
manure in this country, except in cases when they 
are accidentally mixed with sea-weed ; but it is pro- 
bable that the coralines might be advantageously 
employed, as they are found in considerable quan- 
tity on the rocks, and bottoms of the rocky pools 
n many parts of our coast, where the land gra- 
dually declines towards the sea ; and they might 
be detached by hoes, and collected without much 
trouble. 
Amongst excrementitious animal substances used 
as manures urine is the one upon which the greatest 
number of chemical experiments have been made, 
and the nature of which is best understood. 
The urine of the cow contains, according to the 
experiments of Mr. Brande, 
Water 65 
Phosphate of lime 3 
Muriates of potassa and ammonia - 15 
Sulphate of potassa - - - - 6 
Carbonates, and potassa, and ammonia 4 
Urea - 4 
The urine of the horse, according to Fourcroy 
and Vauquelin, contains 
Of carbonate of lime 
11 
