by Dr. J. W. L. Beament.
Although we use oils and waxes for waterproofing leather, paper, and cloth, the layer of wax with which insects waterproof their skin is much more efficient than anything man has ever achieved.
for Schools
(to 11.55)
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by Dr. J. W. L. Beament.
Although we use oils and waxes for waterproofing leather, paper, and cloth, the layer of wax with which insects waterproof their skin is much more efficient than anything man has ever achieved.
for Schools
(to 11.55)