The French Academy of Sciences by comparison with Sir George Schuckburg’s standard at temperature of 32° F., deduced the mètre as 39·3824 English inches, which reduced to standard temperature of 62° F., would be 39·3711, or slightly in excess of the value deduced by Dr. Young from Pictet’s comparisons. The legal value in England is one mètre equal to 39·37079, and the latest reduction is 39·37043 inches by Clarke in 1866, which is probably the most exact reduction. DIFFERENT REDUCTIONS OF THE FRENCH TOISE INTO ENGLISH FEET. Captain Kater, 1799 6·3945925921 feet. Hassler, 1832 6·3951409 “ Chambers’ Encyclopædia 6·39456 “ “ Mathematics 6·394662 “ Wallace 6·39462 “ Nystrom 6·39625 “ Alexander 6·39435 “ Dana 6·3946 “ The following table of reductions as used shows clearly how great a confusion exists in the matter of comparisons: MÈTRE IN INCHES. Phœnixville Hand-book 39·368 inches. Hassler 39·36850154 “ “ 39·370788 “ “ 39·3809172 “ Trautwine 39·368505 “ “ 39·37079 “ Silliman 39·368505 “ “ 39·37079 “ Chambers’ Encyclopædia 39·36850535 “ “ “ 39·3707904 “ Act of United States Congress, 1866 39·37 “ Smithsonian Report 39·37 “ Youmans 39·37 “ Davies 39·37 “ Homan’s Encyclopædia 39·37008 “ Weale 39·3702 “ Ordnance Survey (England, 1866) 39·37043 “ Clerk Maxwell 39·37043 “ Capt. Clarke 39·3704316 “ J. M. Rankine (1870) 39·3704316 “ “ (1866) 39·3707904 “ Alexander (weights and measures) 39·37068 “ Ganot 39·370788 “ Vose 39·370788 “ Act of British Parliament, 1823 39·37079 “ Encyclopædia Britannica 39·37079 “ Hymer 39·37079 “ Davies and Peck 39·37079 “ J. W. Clarke 39·37079 “ Dana 39·37079 “ Whittaker 39·37079 “ Sommerville 39·3707904 “ Chambers’ Mathematics 39·3707904 “