156 THE CONDOR Vol. XXIV 
one would suggest that old Dobbin had learned his sportive capers from the 
newborn calf. The latter furnishes a stimulus to similar activity, and nothing 
more. 
Fig. 37. THE WESTERN MOCKINGBIRD; SAN CLEMENTE ISLAND, | 
Experience with cage birds may be urged against this perhaps fanciful 
hypothesis, for ‘‘teachers*’ are employed, I believe, to develop the maximum 
purity of tone and variety of song in ‘‘roller’’ canaries. But, is not this purely 
for the purpose of attaining ultra-refinement? Every child has an inherent : 
