Fun easy read. It's interesting to note that the book is copyrighted 1964 and that the function of the Golgi apparatus was unknown at that time. Was it really? I haven't had the patience to check yet. Simple web searches cannot settle the matter either way.
The most astonishing thing in the book is a sentence mentioning that flatworms that eat a flatworm that has learned a specific behaviour will take over that behaviour (page 176). No reference! Must find!
Edit: thank you, Wikipedia:
memory experiments in planarian worms. The original article: J. V. McConnell, (1962) Memory transfer through cannibalism in planarium, J. Neuropsychiat. 3 suppl 1 542-548