In February, 1809, he writes: "My studies are at present Optics in Philosophy, Dialling, Homer, beside disputing, composing, attending lectures etc. etc., all which I find very interesting and especially Mr. Day's lectures who is now lecturing on Electricity.

The matter was too grave for pleasant, anecdotical Pennant, who, speaking of the Dial, in his London, says "the description surpasses my powers:" he refers the reader to the above work, a "very scarce book" in his time, and we have been at some pains to obtain the reprint, (London, 1685,) appended to Holwell's Clavis Horologiae; or Key to the whole art of Arithmetical Dialling, small 4to.