101 
places, and he points out, moreover, that some difference 
must necessarily exist in the mean motions. 
In a letter of about this date (1853, June 8), he writes, 
jestingly: “Biela slides on smoothly. I don’t work now, 
as on ’43, wearily and with a Dy, nor boldly and with 
Dégance DQing a change of Inclination, but Dyrely. An 
allowable change of 0.34 in the mean motion will give the 
places in 1852, within 24” + the error of Sanrint’s pertur- 
bations, provided I am right in assigning the nuclei relatively 
to each other; but it is not so easy to tell which is which, as 
T had supposed.” 
Husgzarp’s published investigations reached this point in 
the summer of 1853; and he was leisurely preparing the 
materials for a continuance of the work, when the Imperial 
Academy of Sciences of St.-Petersburg, in December of 
that year, offered its astronomical prize for just such an 
investigation as that on which he was engaged. The distin- 
guished head of the Observatory at Pulkowa wrote specially 
to suggest the publication in the United States of the Pro- 
gramme for the prize ; and it may well be suspected that the 
very able discussion which Husparp had already given 
might, at least in some degree, have tended to assure the 
astronomers of the Imperial Academy that competent men 
were already enlisted in the investigation, whom the liberal 
prize might at once stimulate and reward. And in view of 
the laborious and extended computations, which the solution 
of the problem would entail, a period of nearly four years 
was allowed for the preparation of the memoir. Many of 
UBBARD’s friends desired him to compete for this prize, 
which I think there is no reasonable doubt would have been 
Won by the memoirs which he subsequently published in 
America, 
But Hupparp’s delicate health, together with his earnest 
9* : 
