. La oiseaux. Les oiseaux. VOL. VI.] NOTES. 23 opérations de nidification dans le jardin voici le début de cette année, un Song-Thrush ayant quatre œufs le 12 mars prochain, et une autre jeune le 29 mars ; un Blackbird un œuf le 16 mars, alors que le 5 avril j'ai trouvé vingt-quatre nids, à savoir deux Hedge- Sparrow, douze Bicknell, six Blackbird, tAvo Starling, un Mistle-Thrush, et un Robin, tous avec des oeufs ou des jeunes. Herbert Massey. [C'est une date avancée pour Moor-Hen, mais assez curieusement, M. J. H. Owen m'informe que le 28 mars 1912, il a trouvé un nid avec un oeuf à Felsted, Essex. Les jeunes, à titre exceptionnel

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. British birds. Birds. VOL. VI.] NOTES. 23 Nesting operations in the garden here are early this year, a Song-Thrush having four eggs on March 12th, and another young on March 29th ; a Blackbird one egg on March 16th, while on April 5th I found twenty-four nests, viz. two Hedge- Sparrow, twelve Thrush, six Blackbird, tAvo Starling, one Mistle-Thrush, and one Robin, all with eggs or young. Herbert Massey. [This is a remarkably early date for the Moor-Hen, but curiously enough Mr. J. H. Owen informs me that on March 28th, 1912, he found a nest with one egg at Felsted, Essex. Exceptionally young, two or three days old, were found at Hoveton, Norfolk, on April 2nd (c/. Birds of Norfolk, II., p. 416) and Mr. O. A. J. Lee found highly incubated eggs on April 6th near Callander, N.B.—F. C. R. Jourdain.] Persistence of the Right Ovary and its duct in Birds. Mr. T. E. Gunn contributes a paper to the Proceedings of the Zoological Society (1912, pp. 63-79, Plates II.-V.) on this subject, in which he tabulates a number of observations made by himself as well as those published in our pages (c/. Vols. IV., pp. 188-9, 216-8, V., pp. 45-9). Mr. Gunn shows in the early part of the paper that authors have made few and slight references to the presence of a second ovary. The majority indeed do not admit the presence of a right ovary at all in the adult female. He comes to the con- clusion that neither death nor disaster is " the necessary or even common result of paired ovaries, " and goes so far as to suggest that the suppression of the second ovary is a " retrograde step." Mr. Gunn has made observations on this point since 1892, and has come across forty-five instances of double ovaries. Of these thirty-three have been in the Falconidse. The proportional figures are very interesting, and well worth reproducing here :— Compiled from Mr. Gunn's notes, enumerating the species examined and the proportion of double ovaries occurring. Specimens obtained in Great Br

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