' If -one wishes to realise the wonders of natural selection, he or she should go to the 

 Natural History Museum, in South Xensington, and inspect the Homopterous insect 

 called Flatoides dealbattis^ and think how much decimation of generations it must have 

 required to make that insect's wings indistinguishable from the Lichens on, the bark 

 of trees.' 



