. Scientific news for general readers; a popular illustrated weekly journal of science . and its greater powers, much may be discovered re-specting the varieties of alcoholic ferments. The theory hasalready been started that a perfectly pure yeast {Saccharo-myces cerevisicv) would give an insipid beer withoutcharacter. We would merely suggest in the foregoing remarks thatin spite of the incalculable value of the researches of Mon-sieur Pasteur, to whom brewers will always owe a debt ofgratitude, there still remained, after the publication of hiswork, a wide gulf between empiricism and pure sci
. Scientific news for general readers; a popular illustrated weekly journal of science . and its greater powers, much may be discovered re-specting the varieties of alcoholic ferments. The theory hasalready been started that a perfectly pure yeast {Saccharo-myces cerevisicv) would give an insipid beer withoutcharacter. We would merely suggest in the foregoing remarks thatin spite of the incalculable value of the researches of Mon-sieur Pasteur, to whom brewers will always owe a debt ofgratitude, there still remained, after the publication of hiswork, a wide gulf between empiricism and pure far recent experiments have gone to bridge this overremains to be considered on another occasion. (To be confiniied.) NOTES ON THE HEATING OFBUILDINGS. No. 2.— Hot-Water Circulation (continued.) THE boilers already referred to are generally used withcirculating pipes,having internaldiametersof from twoto four inches, and the maximum temperature of the water inthem may be assumed not to exceed 180 Fah., or the waterin the boiler would be above the boiling-point (212? Fah.).. Fig. 18. We may briefly describe this system as one in which thevolume of water in circulation is large, in which the surfaceof piping which radiates heat to the building is also con- * Studies in Fermentation, p. 186. siderable, and in which the temperature is now have to consider a system in which the volume ofwater and the heating surface of the piping are both small,and in which the temperature is comparatively high. The
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