CALCULATIONS. 307 



of food according to their size than quadrupeds. My 

 own experience corroborates the accounts which I have 

 selected from the testimony of other observers. I took 

 from the nest two young bluebirds, which are only half 

 the size of a jay, and fed them with my own hands for 

 the space of two weeks. These little birds would each 

 swallow twelve or more large muck-worms daily, or other 

 grubs and worms in the same proportion. Still they 

 always seemed eager for more, and were not overfed. I 

 made a similar experiment with two young catbirds, 

 which were attended with results still more surprising. 

 Their voracity convinced me that the usual- calculations 

 bearing upon this subject are not exaggerated. 



