Friedrich Wilhelm August Argelander. 115 
burg one of his pupils to supply it. Though patty Gee 
Apri 
phie Charlotte Courtan; and with her he proceeded, through 
Dorpat (where he renewed his friendship, commenced in No- 
The Observatory at Abo was then newly built and indeed 
hot in all parts quite completed. Its equipments consisted, 
besides smaller instruments and clocks, of a 2-foot repetition- 
rele, a Fraunhofer’s heliometer, and especially of a very good 
oot transit instrument by the same artist. A meridian- 
circle by Ertel was provided in 1825 and was not ready for use 
until the spring of 1827. Before that time, therefore, the 
observations principally consisted of comets, and casual phe- 
Homena of different kinds. When in possession of the merid- 
an-circle, Argelander undertook a more extended course of 
o®servations ; and paid special attention in particular to the 
ee ehich were known or suspected to have a large proper 
n. 
oa the year 1828 and 1829 Argelander completed Hour 
tak, Ht of the Berlin Academy Star-charts, which he had under- 
en. Itis one of the best of the series, and the accompanying 
Posh be forms one of the earliest examples of the accurate 
ae treatment of Bessel’s and Lalande’s zone observations. 
4th ; meantime great changes had occurred at Abo. On the 
pats September, 1827 a fire broke out which laid the greatest 
a € town in ashes, and destroyed all the buildings, 
protec ins of the University. Although the Observatory was 
nected by its isolated position, and lost nothing but a large 
