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ît is fuppofed by many, that there are landâ 

 to the northward of the great mother of feas, 

 the Pacific Ocean, and that they conned the 

 weftern parts of North America with the eaftern 

 limits of Tartary. Thefe lands cannot conveni- 

 ently breed any birds but fuch as inhabit them 

 all the year ; becaufe there are no lands to the 

 fouthward of them for birds of paflTage to pafs 

 unto : fo that, if there be any, they mufl: make 

 long journeys to the eaft or weft, before they 

 can find land more fouth, and in a warmer lati- 

 tude than what they muft leave behind them. 

 I think it reafonable to believe, that many birds, 

 which are conftant inhabitants of warm coun- 

 tries, pafs from one warm country to another, 

 on account of the great rains which fall very 

 heavily at certain leafons of the year, and con- 

 tinue without intermiflion for feveral months to- 

 gether -, while countries very near, perhaps fepa- 

 rated only by a ridge of mountains, enjoy a dry 

 ferene feafon. Numberlefs fuch inftances are 

 given by voyagers : fo that birds may eafily take 

 the advantage of it ^ for it is not eafy to conceive- 

 how 



