Summary: CALENDAR REFORM.—Mr. G. Marvin, of the U.S. Weather Bureau, read a paper on this subject at the Madrid meeting of the Geodetical and Geophysical Union. He dwelt chiefly on the need of more uniform months for the purpose of meteorological records, and the desirability of keeping the date of the equinox as nearly as possible the same. He recommends the system of 13 months of 4 weeks each, and one day each year (two in leap year) outside the month and week.