118 PT. Austen—Dinit librombenzols. 
ype 
parison of observation 
He always kept in view the desirability of obtaining accurate 
meridional observations of all stars down to the nint magni- 
tude, whose approximate positions are contained in the Durch- 
motions of 250 stars, which Argelander was led into by com- 
8. 
was afterwards adopted, with trifling modifications. The Bonn 
Observatory was to undertake one zone of 10° in breadth of 
declination; but Argelander, now approaching his seventieth 
year, entrusted the details of the execution to his assistants, 
engaging himself in labors of smaller compass, such as investi- 
gations of stellar proper motion. | 
Argelander always took a lively interest in the progress of 
science generally, and also in the affairs of the University of 
Bonn, of which he was twice elected Rector. Many of the 
an Associate of our own on the 14th of January, 18381, being 
also our medallist in the year 1863. : 
ntil the summer of 1874 he had always enjoyed excellent 
health; but in August of that year he was attacked by a fever 
of the typhus kind, which visited the neighborhood about that 
their corresponding or honorary members, and he was chosen 
‘ is W 
been affectionately united for nearly fifty-two years), two sons, » 
and one daughter, married to Professor riiger,.survive him. 
W. Won 
£4 
Art. XVITL—On Dinit parad: ls and their Derivatives; 
by PeTeR Townsend Austen. First Paper. 
Two kilograms of pure crystallized solid (para) dibrom- 
benzol were divided into portions of 250 grams, and each por 
eated on a sand bath, when a violent action set in, during 
which it was found advisable to remove the burners. A red- 
