I am interested in buying Charles Darwin books and mostly drawings (nowadays editions, I am not a collector). Please, can you advise in which book and which edition I can find the most of his drawings? I found some books as On the Origin of Species ad the Geology of The Voyage of The Beagle but I am not sure if there are his drawings too. I am a student so I couldn't spend too much money on it, but I was interested in his texts and drawings, supporting each other in one book/journal/publication. Thank you !
I believe that there is only one drawing in the first edition of On the Origin of Species, and it is Darwin's. Any good edition such as the fascimile edition with an introduction by Ernst Mayr, will include this drawing. I'm not sure about other editions of the Origin or other books of Darwin's. However, maybe you don't need to buy anything. Darwin Online is a wonderful collection that includes many (all?) of Darwin's writings over the years, including images of many of them; the drawings are no doubt included.
It's possible that the History of Science and Mathematics StackExchange site would be a better place for this question.