118 AMERICAN MIDLAND NATURALIST. 
Populus foliis subrotundis, etc. var. v Linn. Hort. Cliff. 460. 
1737. 
Populus alba £ Haller. Stirp. Helv. 156, 1742. 
Populus alba a canescens Ait. Hort. Kew. 3: 405. 1789. 
Populus alba Willd. Berl. Baumz, 227. 1796. 
Populus canescens J. E. Sm., Fl. Br. 3: 1080, 1804. Engl. 
Bot. t. 1619. Willd. Bs PL a 802, 1805. Reichenb 
icones Fl Germ, 1130, 0.617, 1 
Populus albo-tremula Krause, Jahrb. she Gesell. 130, 1848; 
Wesm. in D. C. Prodr. 16: 2 pt. 3 
The gray Poplar is found cuins eel in ANS HN it is 
readily recognized by its greenish eray bark and thick branches. 
The latter usually stand at an angle of 60? more or less from a 
vertical line. In this respect P. canescens differs much from the 
true white Poplar. 
III. POPULUS ALBA BOLLEANA. 
Populus alba var. Bolleana. Masters, Gard. Chron. 18:556. f, 
96, 1882. ; 
This form is found occasionally in cultivation. I have observed 
several trees about Washington, D. C. where Dr. E. L. Greene 
called my attention to them. The color of the bark of trunk and 
branches approach nearly that of P. alba. The normal leaves are 
ovate-acute, 5-8 cm. in length, irregularly dentate or sometimes 
lobed; the leaves of the rootshoots are much larger than in the 
true P. alba. These leaves are fully 1 dm. in length and somewhat 
broader; the five primary lobes are variously toothed, incised or 
lobed. 
Washington, D, C. 
Bird Notes. 
WALTER L. HAHN. 
The following notes have no relation to one another and, in them 
selves, may be of little value to science. A large number of observations 
on the changes taking place in our fauna would, however, form a basis 
for important biological deductions 
No such mass of data exists, party because the observations have not 
been made on a large scale, but principally because there has been no 
