REPORT 



ON THE IMMIQR.VTIONS OF SUMMER-RESIDENTS IN 

 THE SPRING OF 1910. 



INTRODUCTORY. 



This Report, which covers the autumn migration of 1909 

 and the spring migration o£ 1910, is drawn up on similar 

 lines to the five Reports previously issued, so as to facilitate 

 comparisons between the different years when the investiga- 

 tions have been brought to a conclusion. The Committee 

 regret that they have lost the assistance of Commander 

 H. Lynes, R.N., who has been transferred to the China 

 Station. 



In a notice of last year's Report [cf. ' Nature,' March 9th, 

 1910), the reviewer seemed to think that as the reports of 

 past years showed very minor differences in the arrival of 

 the various species, there was but little use in continuing the 

 investigations on the present lines, and that, in any case, 

 our present methods were unlikely to add much to what 

 WMS already known as to the real cause and manner in 

 which migration was carried on. He suggested that in 

 order to obtain better results we should extend our opera- 

 tions and work in conjunction with continental observers, and 

 that a systematic ' ringing ' of the birds at the light-stations 

 would probably produce good results. As others may 

 perhaps hold similar views, we may again point out that 

 when these investigations were first undertaken it was 

 decided that they should be carried on over a period of ten 

 years before any attempt was made to generalize, or draw 

 deductions from the facts collected. 



With regard to co-operating with our continental neigh- 

 bours, we may say that we are in communication with 

 several observers who are studying the subject abroad and that 



B 



