12mo, pp. [ii], 154. Leaf L1 an unusual composite of two separate leaves each printed on one side only and stuck together, and seemingly also a cancellans (see below). Untrimmed in original blue paper wrappers backed in white paper. Some soiling, a dampstain to a few leaves at rear. Wrappers soiled and worn, spine largely defective, stitching partially broken. Some old calculations and pen trials to rear wrapper.