Xolcsfrom North IIoUainL 163 



tho otlier band, wlienevcr tliere was any considci'able niove- 

 iiient of small birds, such as Thrushes, Kedstarts, Goldcrests, 

 Cliaffij7cbes, &c., tbey were always met with on tbe grounJ 

 oxaniined, so tbat I do not tbink nuiny movcinents ot" any size 

 escaped my notico. 



Probably owing to tlie invariable snnmier-like wcatbcr wbicb 

 cbaracterised Ijotli iny v'sits, notbing in tlie sba))o of grcat 

 " rusbes " was seen, and bad not I boen carefully on tbe louk 

 out, no special migratory niovcments would bave brougbt tbeni- 

 selves to my notice. 



A glance, bowever, at tbe accompanying table sbows a marked 

 relation between tbe baronieter and tbe number of species in 

 wbicb an increase or decrease was noted, or, in otber words, in 

 wbicb some movement bad taken place. Wben we consider 

 tbis somewbat rougb motbod o£ Observation, for one would bc 

 certain to overlook small movements o£ common species, it is 

 astonisbing to find so close an agreement beivveen tbe two 

 curves, wbicb seems to point unmistakably to tbe £act tbut 

 mi(/nitio)i is niosL marked when tlie 'pfessure is least. For instance, 

 we See tbat tbe fall of tbe barometer on tbe IGtb was marked 

 l)y a rise in tbe number migrating on tbe 17th. Tbe steadv 

 fall of tbe glass between tbe 20tb and 24tli was followed by a 

 rise in tbe number of species migrating until tbe 22nd, and a 

 furtber large rise on tbe 25tb. On tbe 30tb, again, tbe top of 

 anotber small barometric curve was marked by tbe entire 

 absence of any noticeable migration, and tbe steady fall between 

 tbe 6th and lOtb October was again marked by an equally 

 steady rise in tbe number of species on tbe move. Tbe wind 

 does not seem to bave bad any effect, bnt it sbould be re- 

 membered tbat during tbe wbole period it never amounted to 

 more tban a ligbt breeze. The connection between barometric 

 pressure and migration bas, I believe, been clearly demonstrated 

 by Prof. Marek in tbe ' Ornitbologiscbes Jahrbuch ' for IDOO, 

 but I bave not yet bad an opportunity of carefully studyin<>- 

 bis doubtless most interesting p.iper. 



One of tbe first facts tbat struck me was tbe enormous flocks 

 of certain birds, e. g., Limosa lapponica^ Ihcmatopus, Laras 

 mariiius, &c., and tbe next fact in tbis connection was that, 

 unless disturbed, tbey never rose and flew together^ but small 



