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104 THE CONDOR Vol. XIV 100. Hylocichla ustulata swainsoni. Olive-backed Thrush. Seen at Buffalo? Pass saw mill. 10i. Hylocichla guttara guttara. Alaska Hermit Thrush. One seen at Bijou ?reek, May 23. 102. Hylocichla guttara 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 bairdL 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, I saw three young just from the nest. At Mt. 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 HE 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 proba.bly 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 bibliographic 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 p}ace 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