It began by tracing the differences of sex function to their earliest appearances in life on the globe; not only as when in the animal world, two amoeboid globules coalesce, and the process of sexual ...

It began by tracing the differences of sex function to their earliest appearances in life on the globe; not only as when in the animal world, two amoeboid globules coalesce, and the process of sexual generation almost unconsciously begins; but to its yet more primitive manifestations in plant life. In the first three chapters I traced, as far as I was able, the evolution of sex in different branches of non-human life. Many large facts surprised me in following this line of thought by their bearing on the whole modern sex problem.