May, 1916 
THE SIIADOW-BOXING OF PIPILO 
99 
the strongest of the secondary sex instincts. As 1 say, it is of interest only 
when one realizes its cause, and sees the lengths to which it is carried, but I, 
for one, cannot now resist watching Pipilo with interest and commiseration 
Fig. 33. A CHARACTERISTIC NEST OF THE ANTHONY TOWHEE IN A SAOE THICKET. 
whenever I discover him thrusting and countering with his Phantom Rival 
of the Pane. 
Nordhoff , California. , April 9, 1916. 
