2 Bulletin Wisconsin Natural History Society [Vol. 12, Nos. 1 & 2 
ella oil and kerosene were set up at the time of flight, with the intention 
of capturing the imagoes; but it was found that most of the individuals 
captured in these traps were males. This method was found practically 
valueless, because, by its use, not a sufficient number of females could be 
captured to have an appreciable effect on the spread of the epidemic. 
Further experimentation consisted in the liberation of a quantity of marked 
males outside the city limits. It was found that these males were carried 
towards the city by a favorable wind, and that shortly thereafter a new 
epidemic started in the fruit growing districts of the city. Dr. Severin 
suggested the possibility, that the regular epidemics result, when the wind 
carries towards the fruit growing areas the flies that have bred from the 
native wild fruits in the neighboring valleys. 
Some species of fruit-flies occur in Wisconsin and other parts of the 
United States, e.g., the cherry fruit-fly, apple maggot, and the cabbage 
root-maggot. At the conclusion of the lecture. Dr. Graenicher made 
inquiry as to whether or not there are any known tachinid parasites of the 
Hawaiian fruit-flies. Dr. Severin stated that there were none known. 
Dr. Severin was thereupon given a vote of thanks by the society. 
After a short recess, the regular business meeting was called to order. 
The secretary’s annual report was read. On motion it was accepted and 
pli^ced on file. The treasurer’s annual report was then read and referred 
to an auditing committee, composed of Mr. Ward and Mr. Teller. 
The chair read the invitation, extended by the President and Executive 
Committee of the Twelfth International Geological Congress, asking that 
the society send a delegation to this Congress, which is to be held in Toronto, 
Canada, in August of the present year. On motion of Mr. Russel, the 
societ}^ appointed Mr. Edgar E. Teller as its official delegate. 
The secretary made mention of the recommendation passed at a re- 
cent meeting, namely, to allow a discount of 25 per cent on the price 
of non-current numbers of the Bulletin to members that desire them. 
It was thereupon voted that such a discount be given regularly in the 
future. 
In absence of the chairman df the Committee on Programs for the regu- 
lar meetings, the report of this Committee was deferred till the next meet- 
ing. The report of the Committee on Programs for the sections meetings 
was also deferred. Air. Russel reported for the Committee on the Check- 
list of Wisconsin Plants. He said that six of the nine parts of the pre- 
liminary check-list have already been issued; and commented on the fact 
that the bill before the State Legislature, for aid in the plant survey of the 
State, has been indefinitely postponed. 
Mr. R. A. Aluttkowski read a letter from the LTniversity of Illinois, in 
reference to calendar reform. Action on this matter was deferred. 
The auditing committee, having looked over the treasurer’s books, 
reported the same to be aorrect with the exception of an error of five cents 
in favor of the treasurer. On motion of Air. Ward, it was voted to accept 
the treasurer’s report, but with correction of error. 
As a committee on nominations for officers, the chair appointed the 
