Conditions of existence are of importance only in so far as they affect the life and death processes of organisms. The present 1 The lower part of Pettibone Creek has been destroyed by the United States Naval School, otherwise the table would include the records for a point 5 and perhaps a point 6, but probably not 7.

GEh'EIL4t, PHYSICAL AKD INORGANIC. slowly collecting. ii7hatever the cause, hair-ever, the method advocated eliminates it; while in a11 other case5 this method gives the same result as the regula1 OSIC. In the next paper of this serieq will be considered the standardization of a tip, and the calculation, from the drop weight, of surface tension and the molecular weight; while in the succeeding ones, which will appear in the immediate future, will be presented the results already obtained with the fifty or more liquids examined, using tips of various diameters.

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