O F N A T U R E. 109 



countries, gives me an opportunity of illu- 

 ftrating this fubje6t farther by inflances. 



The Jlarling^Fn. 183. finding with us after the 

 middle of fummer worms in lefs plenty, yearly 

 goes inot Schonen, Germany and Denmark. 



The female chaffinches every winter about 

 Michaelmas go in flocks to Holland •, but as the 

 males ftay with us, they come back the next 

 fpring, unlefs fuch as choofe to breed no 

 more. 



In the fame manner the female Caro- 

 line yellow-hammer in the month of September, 

 while the rice, on which fhe feeds, is laid up 

 in granaries, goes towards the fouth, and re- 

 turns in the fpring to feek her mate. 



Our aquatic birds are forced by necefTity to 

 fly towards the fouth every autumn before the 

 water is frozen. Thus we know that the lakes 

 of Poland and Lithuania are filled with /^e^'^^i 

 and geefe every autumn, at which time they 

 go in great flocks along many rivers as far as 

 the Euxine. But in the beginning of fpring, as 

 foon as the heat of the fun molefls them, they 

 turn back, and go again to the northern pools, 

 and lakes, in order to lay their eggs. For there, 

 and efpecially in Lapland, there is o. vaft abun- 

 dance of knats Fn. 11 16. which afford them 



excellent 



