7 
OCCURRING ON MALDEN ISLAND. 179. 
Deducting from each of these the percentage of volatile ecg 
to make the increase more evident, the residues would contain of 
calcic ee 
Top 6 inch iia MEDS apie 44:7 
Aen 6i ah to water level <i, FOB ae 746 
m water — to 18 inches below Sea OO cae 94-9 
ues phosphate ... sia ed Paes 93°4 
I have lately ner to diniciehe the mode of formation of the 
stone phosphate, but without any very satisfactory result. Tri- 
calcic phosphate in solution in water saturated: with carbonic 
entirely co age of caleic shoo 
Amongst the recent guano deposits any loose stones were 
found to ris sinilacky incrusted with calcium phosphate, which 
had in many cases pene trated the stone to a considerable depth, 
sometimes entirely so. They were found on the surface of the 
guano, and not buried amongst . Several of these stones 
up — gave the result No.1, whilst a single stone which 
did n oe on the surface, and was sonorous when struck, 
gave No. 
No. 1. No. 2. 
Loss on ignition Prt ae a ee ed 15°25 12°00 
Calcium phosphate die, 000.  0ne) wee | one 48°50 41°15. 
