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ofi'ers iiimsiiiil clmncos fur l)inls to break tlicir fli^lif. nnd nltim!i(('l\-, 

 porliiips, to roiicli f.lio AtiU'riciiu coast. In the ('(miiiarativoly iiatTow scan 

 botwci'ii tli(* I'liiropcaii coiitiiioiit. iiiul (Iroat Hrilnin birds aro fr(M|iiiMitlv 

 noted as iilitjlitini^ oil tlu; riLr<iin<,' ot' vessels and lit,'btshi|)H, roostiiif? in 

 tlie rij^ging during tlic night, to resinne tlioir iligliL uL tlie iirst streak of 

 dawn. 



It is a, matter of oongnitnlation tlmt our American and Canadian 

 fellow-worki'rs liavo instituted a similai- system of observation on tlio 

 migration of birds. At the iirst C'ongress of the American Ornithologists' 

 Union, iiehl at New Vork City, September ".'(i 2S, |H,S;{, a (Committee on 

 the jMigration of Birds was appointed, it is intended to investigate this 

 in all its bearings, and to tlie fullest jiossiblo extent, not only in the 

 accnninlation of recoi'ds of tlie times of arrival and d(.'partnre of the 

 ditl'erent s|)ecies, but to embrace the collection of all data that may aid in 

 detei-niining the causes which inilnenco migration from season to yeason. 



Your Comniittco respectfully request tlieir reappointment, and ti'tist 

 that the Association will enable them to continue tlie collection of facts. 



Report of the Coinmittee, consisiinf/ o/Profcssov 'Sewto'S ( Secveidr;/), 

 Professor L.ANKKSTEK, and Profcssoi- (J.\M(ii;i:, appointed for the 

 jiiirjio.^'' of preparinu a B'd)l(oi)ivpi':i of certain Urovps (f 

 Iiicei'tebrata. 



Tin-; Committee bog leave to report that the work, compiled by Mr. D'Aicy 

 W. Thompson, li.A., Scholar of Trinity College, Cambridge, though not 

 yet completed, is in a f(unvard state. The whole of the part relating to 

 J'rot(i::>ia, and nearly the whole of tliat relating to Spomjida, have been 

 pi'intcd oil', while a largo poi'tion (Sectiijms A to L inclusive) relating to 

 Cd'h'iifcrata is in type, and the remainder is reported by him to be ready 

 for press. 



The Committee cannot but regret the non-completion of the Biblio- 

 graphy by the time originally expected ; but tluy aro satisfied that the 

 delay has been in great measure due to causes ■which will contribiito 

 lai'goly to th(> value of the work ; and the Commit too have njost thankfully 

 to acknowledt^'e the important services to this end kindlv rendered by 

 Mr. H. B. Brady. F.R.S., Professor lliickel, Professor Wyatt, of Hostou, 

 and Professor Alleyne ^Nicholson. 



The printing of the work has been liberally undertaken by the Press 

 Syndicate of the University of Cambridge, and it will form a volume of 

 about IjOO pages. 



The Committee herewith transmit a copy of the porti(nis already in 

 typo (tivo sheets and twenty-six slips), whence will be perceived the 

 laborious nature of the work, as well as the effective way in which it has 

 been done. 



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