Transcriber's Notes:
[p. 31] "The pollen is thus pushed against the projecting stigma, as shown at Fig. 3, and thus, one by one, the flowers are cross-sterilized." changed to "The pollen is thus pushed against the projecting stigma, as shown at Fig. 3, and thus, one by one, the flowers are cross-fertilized."
[p. 209] Fig. 1 and Fig. 2 which are referenced on this page are not found in the original document.