It started out strong with a great premise, but then about halfway through the evolutionary biology gets wonky and the whole story starts to get a bit silly and even a tad racist. This guy obviously believed that white people are the most evolved race on the planet. I suppose I can't blame him: he published this story in 1918 and it's clearly a product of its time. Still, it's a fun and imaginative read that'll give you a glimpse of what the average American probably thought of the rest of the world at the turn of the 20th century.