  *Since the above was written, the statement is happily borne out by   an official circular, issued by Lieutenant Maury, of the National   Observatory, Washington, April 16th, 1851. By that circular, it   appears that precisely such a chart is in course of completion; and   portions of it are presented in the circular. “This chart divides the   ocean into districts of five degrees of latitude by five degrees of   longitude; perpendicularly through each of which districts are twelve   columns for the twelve months; and horizontally through each of which   districts are three lines; one to show the number of days that have   been spent in each month in every district, and the two others to   show the number of days in which whales, sperm or right, have been   seen.”