Page:Percival Lowell - an afterglow.djvu/156

Percival Lowell

Sir William Crookes made for me a cobalt glass screen through which grass and trees look green and wanted me to try it on Mars. I tried it anticipatorily on the dog, i.e., an ochre carpet and found that that as well turned red. So as it works the same on the just so and the not- just so, no discovery is possible. Furthermore to determine anything it would have to react on chlorophyl alone which it does not, any blue-green being grist to its mill. He is a dear soul. Next year but one he hopes to celebrate his diamond wedding. 120