168 Mr. J. L. Boiihote — ]\fi<:/ration 



ndults of tlie northern migratory Liinicolae are absent, and 

 l)y the middle o£ November (when, according to Herr Gütke, 

 the adults are supposed to arrive) it would need a verv 

 skilled observer to distinguish them from birds o£ the 

 year. 



To siim iip briefly, my observations tend to show : (1) that 

 migration is usually undertaken in many small parties rather 

 than in large flocks ; (2) that the number of species niigrating 

 on any particular day varies inversely as the barometric 

 pressure ; (3) migratory birds are excessively fat on their 

 departure, and thin on arrival, and in many cases their stay 

 seemed to be merely £or the purpose of acqniring a further 

 störe of fat, since as soon as they were again fat their journey 

 was continued ; (4) among the liimicolaj the balance of evidenee 

 is in favour of the adults niigrating earlier than the bulk of 

 the young. 



Finally, it should be remembered that the above remarks are 

 merely notes on observations made, and I have been led to 

 publish them in the hope that it may stimulate further thought 

 on those lines in order that by their proof or disproof a small 

 step may have been made in our knowledge of migration. 



I append a list of the movements of those species which 

 were sufficiently definite to be determined. Notes on stragglers 

 and resident species have not been included. 



Turdus iliacus. — Arrived Oct. 3rd. 



Turdus merida. — Sept. 25thand onwards arriving. Oct. 5th, 

 very large decrease. Oct. 7th-9th, large arrivals of 

 young males. 



Turdus torquatus. — Arrived Sept. 25tli and onwards. Absent 

 Oct. 9th. 



Sanicola (Bnantlie. — A few individuals of this species were 

 seen almost daily until the beginning of Octo})er, after 

 which only stragglers remained. There Mas a large 

 influx on the 22nd Sept., followed by their departure on 

 the follovving day. A further Immigration took place on 

 24th Sept. 



Untlcilla phoenicnrus. — A few seen almost daily during 

 September. Large increase on the 24tli. 



