180 Annals Entomological Society of America [Vol. IV, 



that ought to be pointed out. If a man could jump, in compari- 

 son to his size, as far as a flea, he could jump over a church 

 tower. One might say too much on the relative endurance of 

 animals, of the distance they can travel, unless the animals 

 are of the same size, or unless the law of reduced power of 

 locomotion with added weight and size is taken into account. 

 The rat with the same endurance, I believe, could not travel 

 the distance stated in the paper. 



