Bird Or Flower?

...Sometimes there might be some confusion
Despite Bob Wood's examples in profusion:

"How To Tell The Birds From The Flowers"

(First published in 1917, preceding The Snouters by no few decades.)

Yes, Robert W. Wood invented blacklight; how ever did you guess?

(This very cute book had a hard-fought argument as a backdrop, with figures including Teddy Roosevelt and Jack London duking it out, pen-to-pen and typewriter-to-typewriter.)