There are two meanings of the words possible and necessary which are of special interest to the logician more than to other men. These refer to the states of information in which we are supposed...
From the Robin Catalogue:
A. MS., G-1893-5, pp. 85-141 (pp. sog, 130 missing), with 8 pp. of variants.
Published, in part, as 4.53-56 (but not all of 56) and 4.61-79 (...