104 
THE CONDOR 
Vol. XIV 
100. Hylocichla ustulata swainsoni. Olive-backed Thrush. Seen at 
Ruffalo Pass saw mill. 
101. Hylocichla guttata guttata. Alaska Hermit Thrush. One seen at 
llijou Creek, May 23. 
102. Hylocichla guttata auduboni. Audubon Hermit Thrush. One seen 
at the saw mill at Hell Creek. 
103. Planesticus migratorius propinquus. Western Robin. From Colo- 
rado Springs to Simla, Robins were often seen ; then no more were observed 
until near Fort Collins, when it again became common, and continued more or 
less abundant from there on everywhere we went. At Mt. Zirkel it was seen 
at 9500 feet, and I found a nest with four eggs near camp, July 12. It was seen 
at Buffalo Pass. A few miles below Empire we found a fully fledged young 
one which seemed disabled, and an examination showed its throat to be injured, 
apparently by flying against a wire. It seemed unable to stand up, and fluttered 
about ; I am doubtful if it survived its hurt. 
104. Sialia mexicana bairdi. Chestnut-backed Bluebird. Several seen 
west of Eastonville, on the Divide. 
105. Sialia currucoides. Mountain Bluebird. Often seen from Colo- 
rado Springs to Simla ; after that none until after passing Log Cabin, and that 
morning, June 17, a nest containing four eggs in an advanced stage of incubation, 
was found in an old mailbox at the top of the Pingree Hill. The female belong- 
ing to this nest was secured, and was a partial albino, having white cheeks and 
nape. The species was common all through the North Park; at Walden, June 27, 
1 saw three young just from the nest. At ^It. Zirkel they were seen above tim- 
berline, and were common at Buffalo Pass. Noted at Steamboat Springs, and 
frequently from there to Arvada. 
AN AFTERNOON'S FIELD NOTES 
By J. Grinnell 
T 1 IE following excerpt from my private field note-book for the year 1907, 
is transcribed exactly as originally written, save for minor corrections 
in punctuation and spelling. These notes were written ‘‘on the spot” 
from time to time during the three or four hours of observation. They show 
the nature of a certain type of field observations, how these may be recorded 
in a running narrative style, and there is perhaps some information presented 
of general interest to the student of living birds. 
The experienced observer will probably criticize the method of record, at 
least, while the beginner may find something worth while adopting. One prin- 
ciple, however, the writer is particularly sure of : namely, that a card-system for 
immediate record of field-notes is absolutely impracticable. I hasten to assure 
the reader that I am responsible for a rather elaborate card-system adopted for 
the cataloging of a museum’s collections, and for bibliograjihic purposes. But 
this or any other modification of the card-system I have ever seen has its limita- 
tions, and to my notion is wholly out of place when it comes to putting into black- 
and-white facts as gathered in the field. It is quite possible to copy and assort 
these latter by any kind of system ; but the greatest value, because of the element 
