99 
His approximate size as compared to Goldfinch (size i), Robin 
(size 2), and Crow (size 3). If slightly smaller add — sign, if 
larger a + sign. 
State if the bird is out of focus. 
State if its wing-strokes are plainly seen. 
Other remarks that you may think of value. 
The notes should look like this : 
Madison, Wis., May 14, 1900. Warm, with quite strong south- 
west wind ; sky perfectly clear. 
•<rjt \ 
sr 
Pei-iod, 8:15- 
-8:30. 
c 
1. 11. 
III. 
IV. 
ir. out. 
Speed. 
Size 
4.6 1.2 
very slow 
2 
3.8 8.1 
fast 
I 
3.8 8.1 
fast 
I 
5.2 8.8 
very fast 
I 
4.1 8.5 
fabt 
2 
Remarks. 
Small hawk soaring. 
Flight like goldfinch. 
Flight like goldfinch. 
Curved below center. 
III. and IV. are of less importance than I. and II. 
NOTK. If these directions are not clearly understood, or if you wish further 
information, write. 
This resulted in eight excellent sets of data, and much credit 
is due Mr. Leon J. Cole of Ann Arbor, Faculty University of 
Michigan; Mr. H. S. Warren of Detroit, Secretary Michigan 
Ornithological Society; Mr. William James Rice, Faculty 
Lake Forest University; Mr. O. S. Dart, student University of 
Minnesota, and Mr. Wegemann, student Beloit College, and their 
assistants, for their hearty co-operation in the collection of these 
data. A set consisting of one evening's observations was contrib- 
uted from each Ann Arbor, Detroit and Minneapolis ; from Lake 
Forest there were two, and the writer, with the assistance of Mr. 
