During the preparation of this investigation of Standard Measures a large number of authorities were examined, including the following: Kelly’s “Universal Cambist,” Maunder’s “Weights and Measures,” “EncyclopÆdia Britannica,” “Chambers’ EncyclopÆdia,” Williams’ “Geodesy,” Hymer’s works, “Smithsonian Reports,” “Coast Survey Reports,” Herschel’s “Astronomy,” etc. The only concise and clear statement I found was J. E. Hilgard’s report to the Coast Survey on standards in 1876, which I was gratified to find coincides with my deductions.

Arthur S. C. Wurtele.

Albany, November 26, 1881.