4 Bulletin Wisconsin Natural History Society. [Vol. 10, Nos. 1 & 2. 
Milwaukee, Wis., November 23, 1911. 
Regular meeting of the society. 
Vice-President Dernehl in the chair. Twenty-eight members pres¬ 
ent. 
Minutes of the last regular meeting read and approved. 
The application for membership of Mr. Arthur E. Bergmann, 3123 
Cedar Street, was received and referred to the Board of Directors. 
Mr. M. E. Blystone, of the Weather Bureau, read a paper on the 
Origin, Activity and Movement of Tornadoes. He told of the freaks 
played by the recent tornado in Rock County and. by means of an appa¬ 
ratus, demonstrated the manner in which tornadoes originate. After 
full discussion of tornadoes and storms in general, the meeting ad¬ 
journed. 
Milwaukee, Wis., December 14, 1911. 
Meeting of the combined sections. 16 people present. 
Dr. Dernehl in the chair. Mr. Muttkowski as secretary pro tern. 
Minutes of the last section meeting read and approved. 
Dr. Dernehl read a letter which he had redeived from Dr. Marks 
of Harvard University, written in behalf of Prof. Kukenthal in regard 
to a proposed arrangement for a lecture to the society. The letter 
stated the terms for which he would agree to speak and the time which 
would be most convenient. The matter was discussed by Drs. Barrdtt, 
Graenicher, Dernehl and Russel, who stated that in consideration 
of the present financial standing of the society it would be inadvisable 
to expend a large amount for one lecture. Dr. Graenicher also sug¬ 
gested that Dr. Osgood of Chicago had consented to lecture to the 
society on a former occasion, but had been prevented to do so through 
the necessity of leaving for the South; at the time he had assured the 
committee that he would speak at some later date whenever the society 
chose. The letter was laid on the table until the committee could 
make another report. 
The question of having a meeting during the holidays was then 
taken up and discussed by Drs. Barrett, Graenicher, and Dernehl and 
Messrs. Teller, Russel, and Muttkowski. It was finally moved to drop 
the meeting. Seconded and carried. 
Mr. R. A. Muttkowski gave a talk entitled “Observations on Cater¬ 
pillars.” The talk was illustrated by specimens and plates and was a 
random discussion of various common and some rate types of cater¬ 
pillars. 
Dr. Dernehl, Dr. Graenicher, Miss Elmer, Mr. Pratt and others 
made various remarks on the topic of caterpillars. 
A motion to adjourn was presented and carried. 
