give the alloy a still lower melting point than above ascribed to it, as I 
see that the experiments made by Lipowitz* with my “fusible metal” in- 
dicate for it a much greater fusibility than my measurements. 
Indianapolis, Ind., Dec. 21, 1861. 
13. Preparation of Hydrofluositicic acid.—H. Deyittx prepares hydro- 
fluosilicie acid by causing water to fall, drop by drop, upon a mixture of 
ted 
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} of the author this acid is destined to become of considerable industrial 
port F. H. 
%, 
ison notices layers of green sand at the base of the Pleta limestone 
sia—and in Esthonia and Livonia, sentra to Schmidt, it charac- 
strata which immediately overlie the alum slates. 
fe Occurrence of these green grains in strata near the base of the Pa- 
‘in isches Journal, clviii, 876, Lipowitz found that “ Wood's 
when mad of 8 parts of lead, 18 parts bismuth, 4 parts tin and 
