782 



THE AMERICAN NATURALIST 



{\'oh. XL 



indicated \,vh>\\\ tliere are the ett'eets of increased moisture which 

 may he e(iually if not more important. I)rv or moderately dry 



favorable to (juadriipeds than moist conditions. The plains and 

 forest regions most densely populated with (|iia!hii))ed life, such 

 as those of the African plateau, are reo-ions of moderate rainfall 



densely populated are regions ..f hcavv rainfall and most dense 

 forests and veortation, Mich a^ tho>c of the ecjuatorial belt of 

 South America or the Conu'o n-^ion of Africa. We observe that: 

 { 1 ) Increased raitd'all may (hniinish the supply of liarder grasses 



(2) Increased rainfall may introduce new poisonous (Jr dele- 

 terious plants (see p. TOO). 



pests and new insect barriers. 



foreM nii-iation tracts for certain ( arnivora. It foUows that 

 I,f the northern henii.phnv i. MippuM.! t.) have been, may have 



lusrrf lUn-nrr.s and^ M nist ,ur.— \i is a matter of universal 

 of diseases. Dry h)calities are favorable; moist localities are 



