GAME BIEDS SUITABLE FOR NATURALIZING 7 



perate regions. The Temperate Zone south of the Equator may be 

 found as satisfactory as that north of it as a source of acclimatable 

 species, but the available birds are not so well known, nor have they 

 so often been tried. In some cases also the difficulty of transporting 

 them through the Torrid Zone may prove a formidable obstacle to 

 introduction. 



In canvassing species to be recommended for introduction, the 

 writer has taken into consideration the latitude, temperature, and 

 precipitation of the regions inhabited, as given in standard works 



Figure 4. — American range of the Hungarian partridge, 1929. Solid black indicates 

 localities where established ; crosshatching areas where systematic distribution 

 has been carried on, the exact results not reported 



on meteorology, and has attempted to point out comparable areas 

 in the United States. Maps such as those reproduced by courtesy of 

 the Weather Bureau and the Bureau of Plant Industry in Figures 

 5 to 8 inclusive are of great aid in making general comparisons of 

 climatic factors of parts of this country with those in other conti- 

 nents. In the case of a desirable bird, if the rainfall and tempera- 

 ture of its native home can be fairly well matched, it is safe to 

 assume that other conditions can be so altered and controlled as to 

 make them favorable to its naturalization. Suggestions along this 

 line are contained in a subsequent section (p. 23). 



