Note 255 — Chapter IV · ON THE INTERNAL FORM AND STRUCTURE OF THE CELL
Reading edition
Eight and twelve are by much the commonest numbers, six and sixteen coming next in order. If we may judge by the list given by E. B. Wilson (The Cell, p. 206), over 80 % of the observed cases lie between 6 and 16, and nearly 60 % between 8 and 12.