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for the Advancement of Science. . All 
ae period (July 9) our own vacuum apparatus has not been cudhaleni: 
ya 
vanced to enable us to pursue our operations by its aid; neverthe- 
of ‘ “i 
ai owing to the superior.defecating power of the subacetate e of lead, — 
we have, even with the old and rude machinery, obtained a result of 
cess. Hitherto only. one-sixth per cent. on tei juice of sub-acet 
been used,—but bimagine the quantity may be advantageously i Sa oe 
ed. As filtration: is indispensable for the conducting of this process, —. 
considerable fear was antortait a fermentation might supervene. 
his fear, however, agate as dem purine to be groundless, inas-. 
much as we possess in sulphurous Gold & agent most pi recat «3 dint. 
fermentation. Another speculative fear Sen lest danger might a 
from the lead employed : this fear, too, practice ante el tes to fat en- 
~~ ine without foundation, for not only is the s»'phite of lead most easily 
1oved,—~bu t even were it to remain no injus" could supervene, inas- 
‘much as this. agent is as harmless as chalk. 
“Tn continuation. ——Observations on the Sulphite of re? were made 
Dr. Grecoky;—who stated that he had made experiments on the 
sulphite of lead formed in this process. He admitted ‘els an infinitely 
small portion niet still remain in the sugar, but that he considered it 
guile innocuous. He had indeed fed rabbits and dogs with food which 
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with the hydro-sulphuret of ammonia, iron was often mistaken for the 
former metal. 
Dr. Curistison contended that we had no evidence that the Pet ie 
of lead was innocuous. It was true that in case of poisoning by car- 
bonate of lead sulphuric acid was administered to convert it into the 
comparatively insoluble sulphate ; but this was a case widely eae 
from the slow accumulation of lead upon the system. Dr. Christison 
adduced some examples of exceedingly small doses of lead bathe taken 
in water for more than twelve months before its evil effects became ap- 
they were not affected by many poiso Dogs and cats were the “ity 
animals which could, from their iatecbal structure, be regarded as the 
Tepresentatives of the human system in these investigations. 
‘On the Air and Water in Towns, and the action of Porous Strata on 
Water and Organic Matter ; by Dr. R. A. Surru. 
is a matter of great importance to find from what source it is best 
“to obtain water for sis towns, and how it is to be collected. To these 
