work commenced in an enquiry into the crystallographic differences of certain chemical substances, leading him to the result that certain kinds of chemical fermentation are due to the action of living organisms which are not born spontaneously in the fermenting material but are derived from infection. Lister seized on this and applied it to medicine and surgery. The medical statistics of the war will shew, when they can be prepared, something of what the world owes, measured in lives saved for future work, to these two discoveries; the amount of pain the sufferers have been spared is immeasurable.
Lord Moulton, in his preface to the book, refers with special pleasure to Dr Rosenhain's essay on Modern Metallurgy. The foundation of this work rests on Sorby's application of the methods of petrographic research to investigate the properties of meteorites, and on the
