Jones, on Spring Migration of 1907. 103 



or bird movements until March 51st, although a considerable 

 flight of ducks, blackbirds, and the earlier sparrows occurred 

 on March 17th and 18th. On the 21st the temperature 

 reached 03°, and on the following day 78°, with summer tem- 

 peratures prevailing and no frosts at night until April oih. 

 It was during this period that reports reached me from San- 

 dusky, through Prof. E. L. Moseley, that not only swallows 

 but Chimney Swifts, Nighthawks, and Ruby-throated Hum- 

 mingbirds were seen there on more than one occasion. I am 

 bound to state, however, that none of these birds v/ere seen 

 b}' him, but the reports camle from what seem to be reliable 

 sources. During this period twenty-five species arrived in Ober- 

 lin, none of them being very exceptional. Following this two 

 weeks of summer the temperature dropped and remained low 

 enough for frosts on many nights, with occasional and short 

 periods of seasonable temperatures, until May 11th. During 

 this cold period the sky was usually lowering, especially so 

 at night, and rain or snow was frequent. The only movement 

 of any consequence that occurred during this period was on 

 April 29th, following a warm day and clear night, when 

 thirty species arrived, and with theuT a marked increase in the 

 numbers of many other species which had straggled in despite 

 the unfavorable weather. Low temperatures and heavy weather 

 followed immiediately. May 11th the temperature began to 

 rise and the sky clear and conditions for a large movement 

 improved on the 12th. Along the south shore of Lake Erie 

 the 13th was not onlv the banner day for the year but it 

 proved to be a record breaker in every particular. Not only 

 were the species recorded more numerous than on any 

 previous day in the experience of the writer, but most of the 

 species were represented by unusual numbers of individuals. 

 One of the exceptional features of the flight of April 29th 

 was the great flight of hawks during the early part of the 

 day. The Sharp-shinned and Broad-winged were present in 

 uncountable numbers, and mixed with them or hawking over 

 the marshes we recorded Marsh, Pigeon, Red-shouldered 

 American Sparrow, American Rough-legged, and one other 

 whose identification could not be certainly determined. The 



