From the joint diary of William Cranch Bond and George Phillips Bond, astronomers of the Harvard Observatory: Saturday September 26th 1846 We have not found any observations on either of the comets of June 1845 and February and May 1846 continued so late as our own. I looked'out for a nebulous patch which I marked for a comet and found it stationary. Jupiter has now two broad but rather faint belts and traces of two others. The two plainly visible are near the Equator—they, are less distinct than they were last year—they fade away gradually at their extremities. They seem streaked or mottled. I think the diameter of the satellites might be very nicely found by the time occupied in passing behind Jupiter. I last week saw the passage of the shadow of one of them very finely it was as distinct as...