86 
ay ee ces a al 
cae 
a considerable part of the earlier zones observed with the _ 
Meridian Circle, and two thirds of all the good work done 
with that instrument, is due to Hupparp. 
Still, in my desire to do full honor to the generous and 
ifted man whose loss we mourn, I may not do injustice to 
the living; and at the hazard of incurring the disapproval of 
a colleague, happily spared to us, I must add, that for an 
amount of intellectual labor bestowed upon this work, greater 
even than Hupparp’s, and for the exquisite elegance with 
which the observations with the Mural Circle were elabo- 
rated and made to give character and finish to the whole 
work, we are indebted to Professor Corry, whose transfer 
from the Observatory to the Naval Academy was productive 
of more advantage to the latter institution than to the one 
from which, unfortunately for its welfare, he was taken 
away in 1853. Still his influence and example were not 
lost, and to Professor YarNatL we owe an ample series of 
admirable observations with the Mural Circle, which, in 
connection with those of Mr. Frreuson at the Equatorial, 
saved the honor of a national institution, at the time when 
Hvpparp was precluded by his health from observing, and 
after the departure of Corin; and have furnished valuable 
observations in an unbroken line from this well-equipped: 
establishment down to the time of its resuscitation under 
the original founder, Capt. Grxu1ss. 
The most valuable of Husparp’s observations were 
unquestionably those with the Prime-Vertical Transit In- 
strument. This is essentially the counterpart of the one 
originally designed by Srruve, and which has rendered 
such service at Pulkowa. It was thoroughly studied and 
“Mastered by Husparp soon after his appointment at the 
Observatory, and the scientific portions of the descriptions 
of the instrument were from the first chiefly from his pen. 
