Lecture II

You cannot follow the processes in an annual plant if you take only the immediate conditions into consideration. Examine the structural conditions that follow one another in two consecutive years. (What the sun imparts to the earth, however, has a much longer life.) Do a series of experiments concerning the way in which the plants continue to be relished by creatures such as the grub of the cockchafer, and you will see that what you first thought to be an element of the plant belonging to the present year must be related to the sun forces of the previous year. You know what a prolonged larval stage the cockchafer undergoes, devouring the plant the whole time.