ISBN-13: 9780198504405, 978-0198504405. R A Fisher’s classic The Genetical Theory of Natural Selection was first published by the Oxford University Press in 1930. This Variorum edition will be the definitive version – the only version of The Genetical Theory in print: it will include both Fisher’s original 1930 text and that of a second edition of the book, published by Dover publications in 1958, which is now out of print.