Subject ASC0002lvt
The Field naturalist : a review of animals, plants, minerals, the structure of the earth, and appearances of the sky / edited by James Rennie.
1 - 2, Page 85 (1835)
Natural History Museum Library, London
BHL Page 2492520
Keywords
gnats dancing gnat dance triangle diagram shape swarm insect geometry Darley's Geometrical companion flies sum of angular distances movement