TRANSACTIONS. 41 
FEBRUARY 4, 1890—FIFTEENTH REGULAR MEETING. 
President Henry V. Pelton introduced to the members, 
and about seventy guests, Rev. Geo. D. Hulst, state ento- 
mologist of New Jersey, who discussed ‘‘Insects and 
their Habits.”’ 
At the business meeting which followed, Mr. J. B. T. 
Tuthill and Mr. George B. Rogers were unanimously 
elected members of the Institute. 
The president appointed asa committee on publica- 
tion, 
Dr. Wm. G. Stevenson, Edward Elsworth and James 
Winne. 
Committee on Museum and Library, 
Dr. W. G. Stevenson, William B. Dwight and Charles 
N. Arnold. 
Dr. Stevenson nominated for membership Wm. Silas 
W odell. 
MARCH 4, 1890—FIFTY-FIRST REGULAR MEETING. 
President H. V. Pelton introduced to a large audience 
Prof. W. LeConte Stevens, of Packer Collegiate Insti- 
tute, Brooklyn, N. Y.. who gave a most interesting 
lecture on ‘‘Sensitive Flames and Sound Shadows.” 
The lecture was accompanied by lantern illustrations, 
and a series of most delicate experiments in Acoustics. 
The most recent discoveries in the diffraction of sound, 
which have been given to the public only by Lord 
Raleigh at the Rawal Institute in London, and by Prof. 
Siemens in this country, were most successfully presented 
to the audience. 
At the business meeting Mr. Winne nominated for 
membership Dr. Theodore Neumann. 
APPIL 1, 1890—FIFTY-SECOND REGULAR MEETING. 
President Henry V. Pelton and about three hundred 
and fifty members and guests present. 
