30 Fby, Seasonal Decline in Bird Song-. [j^ 



July 12 — Ditto. 



13 — Ditto. 



14 — Intensity and frequency of song are lessening. 



15 — Ditto. 



16 — Ditto. 



17 — Songs less frequent than yesterday. 



18 — Songs have become infrequent. 



19 — Ditto. 



20 — • At best, songs are much softer and shorter than a week ago. 



21 — Songs are very occasional. 



22 — Ditto. 



23 — Songs becoming less every day. 



24 — Nothing heard but an occasional gurgle. 



25 -r Ditto. 



26 — Ditto. 



27 — No song at all. 



28 — Ditto. 



29 — A phrase of song heard rarely. 



30 — Ditto. 



31 — No song at all. 

 Aug. 1 — Ditto. 



2 — Ditto. 



3 — Ditto. 



4 — One short phrase of song heard. 



5 — No song at all. 



6 — Ditto. 



7 — A single short phrase of song heard. 



8 — No song. 



9 — Ditto. 

 10 — Ditto. 



Note : — The scold notes were numerous throughout the entire period . 



It was immediately noticed that cold or rainy weather caused 

 an evident depression in the songs of that day. Hence tempera- 

 ture, direction and strength of the wind, cloud conditions, humidity, 

 and also the hour at which the observations were taken, as well as 

 the exact localities visited, were daily recorded. In the final con- 

 clusions as to general song decline, local depressions caused by the 

 weather, have been omitted, as they were of a purely temporary 

 nature. 



It would be interesting to repeat this study in the same locality 

 for five or six successive years, keeping strict watch on the average 

 temperature of each summer, to discover if a comparatively cool 



