Astronomy and Meteorology. 369 
He has also published an analytical investigation of the ques- 
_ tion of the stability of Saturn’s rings, in which he arrived at the unex- 
onginally contrived by the late W. C. Bond and his two sons, in which 
the movement of the recording barrel is regulated by their well-known 
Spning-governor. On the piece of transparent mica exhibiting the tran- 
sit lines, is also drawn a series of horizontal lines, 10’ of declination 
tinued ; and in his report for 1864 it is stated that the region between 
‘ had been nearly completed, and that great progress 
had been made in the zones between 1° 10’ and 1° 20/ 
t is only necessary to read the Reports of the “Committee of the 
Overseers” of Harvard College, and the accompanying Reports by the 
Director of the Observatory, to show that the same zeal animates Pro- 
tG. P. Bond that was so strongly evinced by his father. The vast 
amount of work accomplished in the way of observation, reduction of 
~ results, and. their publication, is truly surprising, for we 
ing an estimate always bear in mind that the Observatory of Har- 
vard College has very small means at its disposal, in comparison with 
the Magnitude of its undertakings. 
There is one claim to recognition which I. of al] persons, must not pass 
over without notice—namely, the first application of photography to astro- 
nomical observations; for it was my seeing in the exhibition of 1851 a 
lunar Photograph, which emanated from this Observatory, that stimu- 
.~ Me to undertake experiments in that direction. The first applica- 
* Presented to the American Academy of Arts and Sciences, April 15, 1851. 
