Darwin's children and the Origin of Species Manuscript

In the age before laptops, authors would hand write manuscripts on paper (imagine!). Now imagine an interactive father and a houseful of children. 

The result, manuscripts with lots of scribbles and drawings from children. Doubtful Darwin would have been upset. Typesetters are quite able to tell the difference between the author's writing and those of children. 

Blogger Benjamin Breen, writing for The Appendix, has a great essay on the scribbles on drawing found on Darwin's manuscripts. Great stuff.