THE POPULAR SCIENCE MONTHLY. 



Fig. 3. 



Three successive flights of pigeon No. 2. 



First flight, May 29. 



. Second w June 5. 

 , Third " June 2i- 



the country. About fifty such tracings were taken, of which a 

 few of the more instructive are reproduced below. 



A few days of freedom were allowed, in order that the birds 

 might more exactly locate their loft ; then all were again confined 



