From a drawing by Charles R. Knight 



A MOOSE THAT LIVgD IN NEW JERSEY IN PEEISTOCENE TIMES : CROVALCES 



A primitive moose-like form, a nearly perfect skeleton of which was found in southern 

 Jersey some years ago. In size and general proportions the animal was Hke a modern 

 moose, but the nose was less developed, and the horns were decidedly different in character. 



might have been restocked after the loss 

 of a formerly existing fauna. 



SPECIES COME AND SPECIES GO 



The differences in the geographic dis- 

 tribution of mammal life between North 

 and South America and the relationships 

 between our fauna and that of the Old 

 World are parts of the latest chapter of 

 a wonderful st'ory running back through 

 geologic ages. The former chapters are 

 recorded in the fossil beds of all the con- 

 tinents. While only a good beginning has 

 been made in deciphering these records, 

 enough has been done by the fascinating 

 researches of Marsh, Cope, Osborn, 

 Scott, and others to prove that in all parts 



of the earth one fauna has succeeded an- 

 other in marvelous procession. 



It has been shown also that these 

 changes in animal life, accompanied by 

 equal changes in plant life, have been 

 largely brought about by variations in 

 climate and by the uplifting and depress- 

 ing of continental land-masses above or 

 below the sea. The potency of climatic 

 influence on animal life is so great that 

 even a fauna of large mammals will be 

 practically destroyed over a great area 

 by a long-continued change of a com- 

 paratively few degrees (probably less 

 than ten degrees Fahrenheit) in the mean 

 daily temperatures. 



The distribution of both recent and 



397 



