1922.] Recently published Ornitholvyical Works. 589 



Tollenaar on egg-layiny in wild birds. 



[Legperioden en eierprodiictie bij eenige wilde vogelsoorten, vergelekeii 

 met die bij lioeudorrassen door D. Tollenaar. Med. Landbouwhooge- 

 school, Wageningen, vol. 2.'?, pt. 2, pp. 1-46, 1922.] 



In this paper, published by the Dutch Agricultural School, 

 an attempt is made to deal with the factors that assist or 

 retard the laying of eggs by wild birds, Avorking with the 

 same methods so successfully applied, chiefly in the United 

 States, by Prof. Pearl and others to egg-production in the 

 domestic fowl. The chief factor dealt with is the weather, 

 not only in its direct effect on wild birds, but also in its 

 indirect effect through its influence on insect-life, which is 

 so important in the rearing of the broods of even the hard- 

 billed birds. 



Most of the observations were made on Tits, Redstarts, 

 and Thrushes, and are shown plotted down on diagrams. 

 At the end of the paper, which is written in Dutch, is an 

 English resume to enable foreign readers to follow the 

 argument. 



Fan Oordt on Spitsbergen birds. 



[Ornitiiological notes from Spitsbergen and northern Scandinavia, 

 1921. By Dr. G. J. van Oordt. With 1 text-figure and 4 plates. 

 Ardea, x. 1921, pp. 129-170.] 



It will be remembered that Mr. Jourdain and his party 

 when they went to Spitsbergen last year met a Dutch 

 ornithologist engaged in a similar mission, and that they 

 were able to be of mutual assistance to one another. 

 Dr. van Oordt, the Dutch ornithologist, has now published 

 an account of his journey and a list of the birds he met 

 with, and the eggs and skins he collected on behalf of the 

 Zoological Museum, Amsterdam, and other Dutch museums. 

 Dr. van Oordt spent most of his time at Cajjc Boheman on 

 the northern side of Ice Fjord, where he was joined by the 

 members of the Oxford Expedition on 12 July, and where 

 he was able to show them the nests of tlie Phalarope and 

 the King-Eider. 



The greater part of the paper is iakvu up with a systematic 



