B Fallacies. 



Thle Xliotriiif/ Xiniifn'i- of Dixtiix-liir MiniiHe* mnf (leiiei-n of M<ininilx ami 

 />//</>; of tin' Ariil Xon'n-iot < 'oinjxtml n'ith tin 1 Ifuniiff Hotiormi, mnl of the 

 SiinoniH axil ]}'liofi' < ',nito<ti-<'<l irifh the Hoiwi! <is a Whole. 



Descending to species, the contrast is even more marked. 



The above table shows, so far as the genera of mammals and 

 birds are concerned, that the difference between the humid 

 ' Atlantic ' or ' Eastern Province ' on the one hand and the 

 arid Great Plains and Great Basin on the other is less than one- 

 fourth as great as the difference between the Sonoran and Boreal 

 Regions. 



These facts, it seems to me, should suffice to establish beyond 

 dispute the subordinate part played by humidity in compari- 

 sion to temperature, and should dispel any lingering doubts 

 that may still haunt the minds of conservative naturalists re- 

 specting the necessity of abandoning the long accepted division 

 of the United States into Atlantic, Central, and Pacific provinces. 



REMARKS RESPECTING SOME OF WALLACE'S FALLACIES. 



Wallace, in his great work on Geographic Distribution, and in 

 subsequent writings on the same subject, greatly underrates the 

 importance of temperature as a factor in determining the distri- 



Si/ont //x and L///M- are omitted because they range over most of the 

 forested part of the P>oreal Region. 



t f'tifoi'ittx isomitted because it ranges over much of the Sonoran Regoin. 

 7 I'.nti.. S.M-., WASH., V..i, VI L is'.n*. 



