I came across this book cover a while ago, and thought it would be a great image to send to some one as an insult. But I got over that and in putting this collage together have been amazed by the wonderful work of the books illustrator Elizabeth Mabel Buchsbaum who was the sister of the author. There is a great profile over at the Indiana Illustrators and Hoosier Cartoonists blog. I just think the slightly startled flatworm in the middle is great. You can still buy it, as its considered the definitive text book on invertebrate animals.