TRANSFER OF LOEW’S COLLECTION TO CAMBRIDGE 
87 
“ Kreistag,” and in the “ Kirchenrath,” and these occupations ended 
with his above-mentioned illness. Under such circumstances, the 
work prepared for the Catalogue had not yet reached the amplitude 
that Loew had hoped to give it (“ Leider sind die von mir gefertigten 
Arbeiten nicht ganz zu dem Umfange gelangt, den ich zu erreichen 
hoffte ”). 
The letter goes on as follows: — 
“ This burden of occupation on my side, and the frequent changes of resi¬ 
dence of Baron Osten Sacken, were the cause that a great part of the work on 
Xorth American Diptera prepared by me has not yet come into the hands 
of Osten Sacken, and has not yet been published. It would be very re¬ 
grettable if this should not be retrieved. As soon as I am in condition to 
go to work again, I shall resume my regular correspondence with Osten 
Sacken, and shall endeavor to continue it steadily, because such is the only 
way to convey the collection into your hands in the most expedient and 
satisfactory manner. 
“Furthermore, it is only through a conference with Osten Sacken that it 
will be possible for me to decide which portions of the collection should be 
sent to Cambridge first, in order to be serviceable to him for the prepara¬ 
tion of his intended new edition of the Catalogue of Diptera. In case you 
should prefer to receive the whole collection sooner, without making use 
of the preliminary work prepared by me for the compilation of the new 
Catalogue, it will perhaps be possible for me to accomplish this, within a 
reasonable time, with the help of an entomological friend. However, the 
aim in view would be attained in a better and more satisfactory manner 
with the personal aid of Osten Sacken.” 
Whatever the work “ prepared for the Catalogue ” may have 
been, I have never seen a particle of it, except a few scraps which 
will be noticed below, in my “ Report" to Mr. Alexander Agassiz. 
In the mean time, the Catalogue I had prepared independently of 
Loew was finished in manuscript, and only required collating with 
the collection in Guben. 
The original German of the last paragraph of Loew’s letter runs as follows : — 
“ Durch diese Arbeitslast auf meiner Seite, und rlurch die hiiufigen Ortsveran- 
derungen des II. Baron Osten Sacken andrerseits, ist der grosste Tlieil der von mir in 
dieser Zeit gefertigten Arbeiten iiber die N. A. Dipterenfauna noch gar nicht in die 
Hiinde von Baron Osten Sacken, und nocli viel weniger zur Publication gelangt. Es 
wiirde selir bedauerlich seiti, wenn dies nicht nocli nachgeholt werden sollte. Sobald 
ich wieder etwas arbeitsfahiger sein werde, will ich mich von Neuern mit Osten Sacken 
in feste Verbindung setzen, und dauernd darin zu erhalten suchen, da nur mit Iliilt'e 
