626 The Fourth International 



on the verge of extinction, and those threatened with 

 extinction, and the more notable points on all headings were 

 well brought forward and illustrated. After the lecture a 

 bounteous lunch was served, and the party then divided — some 

 going to examine further specimens in the Museum, others 

 driving to the Reservoirs or round the Park. 



Friday morning was devoted to a General Meeting, at 

 which Dr. Bureau exhibited a bound volume of Brisson's 

 plates, coloured. The lettering on the original plates had 

 been removed and new lettering added, suggesting therefore 

 that it was not merely a collection of the plates coloured, 

 but rather a separate edition. Dr. Bureau stated, however, 

 that he had been unable to see or hear of a similar 

 example. The copy in question had been purchased at the 

 sale of the late M. Milne-Edwards's library. Mr. Bonhote 

 read a paper, illustrated by specimens and slides, of his experi- 

 ments in hybridising Ducks ; and, after shewing the hybrids 

 he had obtained, which included crosses between three, four, 

 and five distinct species, and for which a special terminology 

 was suggested, he then went on to point out that hybrids 

 shewed great range of variation and that such variations 

 followed on the lines of " poecilomeres. ,, It was also 

 suggested that variations generally followed definite lines, 

 and that many so-called cases of reversion were merely due 

 to variation on these lines. Dr. Leverkiihn brought to the 

 notice of the Congress some of Prof. Naumana's corre- 

 spondence, and he hoped the Congress would support the 

 meditated publication of these letters. Dr. Hartert's paper 

 dealt with the " Principal Aims of Modern Ornithology/' 

 laying stress on accuracy of labelling and careful and minute 

 study. Dr. Wilson's paper on the Birds of the Antarctic, 

 illustrated by his splendid series of slides, brought the 

 morning's work to a close. 



In the afternoon the Lord Mayor held a reception at the 

 Mansion House which was largely attended, and an oppor- 

 tunity of visiting the Guildhall was also taken advantage of 

 by many members. 



In the evening a very successful dinner was held at the 



