found Mercury to have variety of Phases, like the Moon; as, now Horned, then Gibbous, and at other times Round. But I conclude this Account with the most Worthy and Learned Prelate Dr. Seth Ward, now Lord Bishop of Sarum who among his other excellent Performances in Astronomy, hath demonstratively proved the Elliptical Hypothesis, which is the most plain and simple, and performed by fewer Operations than either of the other. This indeed was first discours'd of by kepler, advanced by Bullialdus, but demonstrated by this accomplish'd and Venerable Bishop, an Honourable Member of the ROYAL SOCIETY.
Improvement of Opticks and
I come next (5.) To consider the OPTICKS whose Improvements are of great importance in the matters of general Philosophy and humane Life, since the