1908] 
Proceedings. 
7 
fact that the Society had not held its last meeting individually, having 
met in combined session with the Wisconsin Academy of Arts, Sciences 
and Letters, and with other scientific societies. 
Mr. Colles exhibited some rocks and fossils from Yellowstone 
Park and made some remarks concerning the general geological 
features of the region. 
]Mr. Burrill called the attention of the members to the spruce 
gall-louse and asked concerning the occurrence of spruce trees in this 
vicinity. Several members took part in the discussion which fol- 
lowed. ]Mr. Burrill spoke of the interest which attaches to the distri- 
bution of these insects and the members agreed to look for their 
occurrence in our locality. 
]Mr. Doerflinger called attention to certain prehistoric artifacts 
from France and Switzerland and the persistence of some types of 
manufacture very similar among primitive sections in France at the 
present day. The preservation of these wooden articles led to a dis- 
cussion of the question as to how long- wood could be preserved under 
natural conditions, particularly under water. After some discussion, the 
topic turned to the formation and preservation of deposits of peat and 
the way in which the size of these deposits could be utilized in meas- 
uring time , particularly the time between glacial epochs in the 
Northern Hemisphere. 
The meeting then adjourned. 
Milwaukee, March 26, 1908. 
Regular monthly meeting of the Society. 
President Teller in the chair and fifty persons present. 
The minutes of the last regular monthly meeting were read and 
approved. 
The name of Eev. Judson Titsworth, 216 Martin Street, Milwaukee, 
was proposed for active membership in the Society and he was later 
elected by the Board of Directors. 
There being no further business. President Teller introduced 
Dr. Strong, of the University of Chicago, who spoke on '"The Brooding 
Habit in Birds," a discussion of the evolution of the brooding instinct 
in animals and its occurrence in various groups. 
Dr. Strong's lecture was illustrated by a large series of slides 
made from original photographs. 
At the close of the lecture. President Teller expressed the thanks 
of the Society to the speaker, after which the meeting adjourned. 
