Since May of this year the Museum of Natural History at Leyden is carrying into execution the inquiry into migration and other movements of birds in the Netherlands by means of aluminium rings. The results will be published in this periodical and at the same time in Dutch in the periodical of the „Nederlandsche Ornithologische Vereeniging”. It is not necessary to give here particulars about our method of working or about the rings used, only I will remark that our rings are of ten sizes. The smaller rings are marked MUSEUM the larger ones MUSEUM NAT. HIST., all of course also LEIDEN LEIDEN—HOLLAND numbered. Since May more than 2500 rings have been sent to 40 persons, willing to co-operate at the scheme for marking birds in our country. As far as I can see from the received schedules, filled-in by the markers, 1165 of these rings have been used for the following 31 species: Ciconia ciconia 3, Phalacrocorax carlo 6, Anas boschas 160, Nettion crecca 2, Larus argentatus 84, Larus ridibundus 381, Sterna cantiaca 138, Sterna fluviatilis 170, Sterna minuta 2, Recurvirostra avosetta 14, Haematopus ostralegus 17, Vanellus vanellus 23, Totanus totanus 8, Pavoncella pugnax 19, Athene noctua 1, Alauda arvensis 3, Sturnus vulgaris 26, Turdus musicus 17, Phoenicurus titys 9, Aëdon luscinia 3, Accentor modularis 3, Muscicapa grisola 1, Phylloscopus collybita 1, Parus major 10, Parus coeruleas 2, Anorlliura troglodytes 4, Hirundo rustica 20, Delichon urbica 2, Fringilla coelebs 9, Chloris chloris 6, Passer montana 1, Passer domestica 18 and Emberiza citrinella 2. Of these 1165 ringed birds, up to the beginning of November, 22 have been recovered, viz.: Anas boschas, all marked at Ellemeet, on Schouwen, province Zeeland, by Mr. A. Man in ’t Veld.