Figure 10.

Charles Darwin’s Notes about Schleiden’s Book The Plant; A Biography.

Here, Darwin makes the connection between flower and inflorescence development, as described by Schleiden, and the laws of morphological differentiation of von Baer. The text reads: “Consider each organ as a separate blossom, & their union as one flower first stage in development, then the formation of floral envelopes & ‘finally in the highest stage nature unites a number of separate flowers into one great definite whole’ [I think this view viz ‘morphological differentiation’ of V. Baer here very true.].” (Image courtesy of Cambridge University Library.)