220 THE ZOOLOGIST. 



Chaffinches travel largely by daylight, I may say that I actually 

 saw several descend and alight on the Eock. The prevailing 

 weather had little effect : in markedly rough weather, however, 

 they often were absent ; they appeared on the Eock at times 

 when no Chaffinches were seen for days before and after near 

 the lantern. Post-mortem examination showed that in the 

 case of vigorous birds collected in broad daylight (mostly three 

 or four hours after dawn), the bodies were well-nourished, and 

 the gizzards contained some foodstuffs. The same was found 

 to be the case in specimens which were collected when striking 

 the lantern, and in specimens found in a dying state in the early 

 morning following a migration night. The latter no doubt had 

 injured themselves at the lantern ; indeed, objective as well as 

 circumstantial evidence showed such to be the case. But I 

 have also obtained a few dead specimens on the Eock in very 

 poor condition. These were evidently birds which remained 

 on the Eock from stress of weather. Being largely grani- 

 vorous in their diet, they soon succumbed, as the form of food 

 obtainable on the Eock, i. e. insects, minute crustaceans, and 

 molluscs, was little partaken of, either because it was not readily 

 discovered, or was too foreign to the bird's taste. Further 

 particulars, especially in regard to the question of immigration 

 and emigration, will be given subsequently on the migration of 

 this bird separately. The features of migrations of Greenfinches 

 and Grey Linnets, migrations largely effected in daylight, are 

 markedly similar to those of Chaffinches. But I saw consider- 

 ably less of the former two species, and made no records of 

 these birds striking the lantern. However, a tame and listless 

 Grey Linnet was captured by Mr. Glanville on the Eock on the 

 morning of April 22nd, 1912, and the occurrence of this bird 

 cannot be dissociated from the occurrence of great numbers of 

 several species— probably including Grey Linnets — at the lantern 

 during the previous hours of darkness. In passing, I may 

 mention that I have seen in broad daylight also a Yellow 

 Bunting and a Snow-Bunting (each on a separate occasion) 

 suddenly, as they were passing at a considerable height, 

 swoop down and alight on the Eock. I thus was enabled to 

 ensure their identification. It was self-evident that the birds 

 were effecting a diurnal migration. Other species, whose diurnal 



