Scarcity of Swallows
Abstract
THE following may not throw light upon the scarcity of swallows in England this year, as noted in NATURE of July 14, p. 628, but will explain a shortage in another part of the world, and may be of interest and suggestive.
- Publication:
-
Nature
- Pub Date:
- August 1921
- DOI:
- Bibcode:
- 1921Natur.107..779P