634 Recently published Ornitliological Works. 



of the Gannets on the Stack in the past^ she is of opinion 

 that it has been largely due to the vast quantities of other 

 sea-fowl scattered amongst them. There are thousands of 

 Guillemots and Kittiwake Gulls on the Stack, and, taken 

 altogether, they probably confused Captain McDonald's eye 

 at a distance. 



The Duchess had been asked to obtain, if possible, whilst 

 on her cruise, some confirmation of the nesting of Gannets 

 on North Rona. This was reported to Mr. John Swinburne 

 to have been the case when he was there in 1883 (^see Proc. 

 R. Phys. Soc. Edinburgh, viii. p. 65). The Duchess, how- 

 ever, could learn nothing authentic about it, but she does 

 not consider the Rona cliffs adapted to Gannets, and the 

 report may have originated in error. Yet their propinquity 

 to Sulisgeir, where there are supposed to be 8000 Gannets 

 [see ^ The Gannet,' p. 325), makes it probable that Gannets 

 have occasionally bred there. 



XL. — Notices of recent Ornithological Fuhlications. 



Aiken and Warren on the Birds of Colorado. 



[The Birds of El Paso County, Colorado. By Charles E. H. Aiken 

 and Edward R. Warren. Colorado College Publ. Sci. Ser. vol. xii. 1914, 

 pp. 455-603, 24 plates.] 



The pleasant towa of Colorado Springs, lying at the 

 eastern base of the Rocky Mountains and overshadowed by 

 Pikers Peak, which reaches an elevation of over 14,000 feet, 

 is the chief town of El Paso County in the State of 

 Colorado. Mr. Aiken has resided in the town more or less 

 continuously since it was founded in 1871, and all his leisure 

 time has been devoted to observing and collecting the birds 

 of this region. The junior author, Mr. Warren, came to 

 Colorado Springs in 1881, and has interested himself in 

 both Mammals and Birds, and in 1910 published an 

 excellent manual of the Mammals of the State. 



The joint authors are therefore in every way fully qualified 

 for their task in preparing a list of the birds of El Paso 



