Birds. 



6531 



undeveloped condition of the cerebrum. In none of the Articulata has 

 any trace of this organ been discovered : a rudiment of it, however, 

 has been supposed to exist in the cuttle-fish." 



We then find these further remarks in the text : — " The only distinct 

 indication of Intelligence displayed by Invertebrata, is the slight degree 

 of capacity of ' learning by experience' which some of them display: 

 this capacity being limited to the mere formation of associations 

 between mental states called up by different objects of sense, which 

 we observe to be the first stage in the development of mental powers 

 in the human infant. And it is interesting to observe that this 

 educability is less displayed by insects — in which we may consider 

 the automatic tendencies as attaining their greatest development — 

 than it is in spiders, which present in several parts of their conforma- 

 tion an approximation towards the Vertebrated Series." — ' Human 

 Physiology,' pp. 665— 667. 



With this quotation I bring the present series of papers to an 

 end. 



J. C. Atkinson. 



Danhy Parsonage, Grosrnont, York, 

 April, 1859. 



Errata. — In the note to this paper, Zool. 6488, for The elephants, two read The 

 elephants too, and, two lines lower down, for set read sit. 



Remarks upon the Migration of Birds. 

 By A. G. More, Esq., F.L.S. 



It was the apparently exceptional case of a small-billed migrating 

 warbler being found upon our shores in winter that first drew my 

 attention to a movement little noticed, but which, it is believed, will 

 be found to take place regularly in autumn and winter, in a nearly 

 direct line from the East to the West of Europe. 



The black redstart is well known to occur every winter at different 

 spots along the channel, as well as in other parts of Great Britain, a 

 country which, for all practical purposes, occupies with regard to 

 Europe a westerly position ; yet this redstart scarcely reaches so far 

 North as Scandinavia in its summer migration, though it is common 

 at this season in the more central parts of Europe. 



Several herons, as the great egret and buffbacked herons, also the 

 ibis and the little owl, have been seen in England in late autumn or 

 winter, and all these, it is well known, are found during the breeding 

 season to inhabit the eastern and southern more than the northern 



