0 a es 
143 
Note on Huan Island Guano. 
By W. A. Drxoy, F.C.8., F.I.C., Lecturer on Chemistry, 
Sydney School of Arts 
[Read before the Royal Society of N.S.W., 4 December, 1878.] 
In a paper which I read before the ee 4 on the guano deposits 
of Malden Island, and which was published in the Society’s 
Journal, Vol. XT, Tr observed that the deeper layers of g 
wae ae richer in calcium phosphate than those nearer the 
organic matter ranges in many of the samples between 20 
and 25 per cent., and although somewhat nitrogenous it is 
ammonium, the bec horie acid being determined in the scibatioasy 
which was of a dark brown colour. It was found, however, on 
addi ing magnesia mixture to the solution and allowing it to a 
t dark wa ne were cents with the ammonio 
