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THE SCIENTIFIC MONTHLY. 
570 
pean caves (with perhaps the exception of the celebrated Neauderthal, the age of 
which is doubtful) do not differ more from Europeans than do several of the low¬ 
est modern races. In other words, no proof of the existence in former times of 
a race of men inferior in general organization to the Australian, and forming any 
nearer approach to the lower animals, has yet been discovered. 
The amount of good a single bird does and is continually effecting for the 
human race, is inestimable, and can hardly be overrated. One robin or thrush 
will destroy more noxious insects in a day than a man could in a week. The little 
grain and fruit they eat is far overbalanced by the insects they destroy, which, if 
left to multiply, would soon destroy all vegetation and make this green earth a bar¬ 
ren desert. The swallow, night-hawk and martin live entirely upon insects, and 
their whole lives are given in the benefit of man. Man’s own interest should be 
to spare the birds. Notone should be allowed to be destroyed. 
Tie UiM States, Canaia, ft Brltisl Miaces, EiliJ aaJ Scetlaalj' 
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