agglomerated under water int© a very hard semi-transparent 
mass, resembling flint in its fracture and other respects. 
The point of interest in connexion with it was the shortness 
of time and small amount of pressure required for the 
transformation of the soft gelatinous into the tiard siliceous- 
like condition. Mr. A. Noble mentioned having formed a 
subatance reiembling flint by firdt gelatinising, and then 
drying in air an aqueous solution of silicic acid obtained by 
dialysis. The lateness of the hour prevented any further 
discussion on any of the papers. 
WM. LANT CARPENTER, 
Hon. Reporting Secretary. 
