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Mar. 17, 1888

My dear sir:

By a letter recieved a few days
since from [Mr. Alvan Black?] I [learn?] that
[ Mr. O'neil?] of Paris, one of the two best and
most sucessful manufactures of optical
glass in the world, has made 19 unsuccess-
ful attempts to cast a disk for the object
glass of the great [Lick?] telescope, and the
experiments one to be continue with success is
attained. The practical method of making
the unground lens is to prepapre a double [convex?]
mold somewhat larger than the lens required and
into this [to pour?] the mother glass. This rough