Aberrations of plumage coloration are caused by hereditary and environmental factors and are not rare in wild birds, but few studies have estimated their frequency in natural populations. Here, we ...
COLOUR-ABERRATION OF REFRACTING TELESCOPES.—At a recent meeting before the Royal Astronomical Society, the proceedings of which will be found in the Observatory (No. 208, December), Mr. H. Dennis ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results