Sedgwick. 45 
often the case in the photographic scales of ordinary spectro- 
scopes, but such as will facilitate the estimation of tenths of a 
division. Two such eye-pieces have been constructed, and 
employed by me with much satisfaction in the mapping of a 
large number of spectra furnished by prisms and gratings, par- 
ticularly in those cases where the spectral lines were quite faint. 
Columbia College, June 4th, 1873. 
ArT. XI.—ADAM SEDGWICK.* 
ed with such enduring and affectionate respect. 
Born in 1785, of a family long resident in a secluded York- 
shire valley under the shadow of Warnside, the boy early ac- 
native dale of Dent were treasured in his memory, and one of 
chair. The su 
aim of £1,000, and others follow on the circular of £200 to £10. The London 
ittee, consisting of the Duke of Argyll as President, Sir Charles Lyell and 
atspe-namig “invite the scientific centers across the Atlantic to as 
a of the foundation-workers in geological science, a man whom all should 
light to honor. Subscriptions for “The ick Memorial Fund” may be 
Sent to Messrs. Robarts, Lubbock & Co.’s, Lombard Street, London.—Eps. 
* 
