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Updated: May 17, 2025
With regard to internal development, after the discharge of spermatozoa in the breeding season the spermatogonia divide and proliferate, forming groups of cells known as spermatocysts. In June and July spermatogenesis is active, and from August to October the formation of ripe spermatozoa is completed. The corresponding changes in the thumb-pads are as follows.
With nothing to do but to drink the light and air with their leaves, to let their cells proliferate, to feel their rootlets draw the sap, is it conceivable that they should not consciously suffer if water, light, and air are suddenly withdrawn? or that when the flowering and fertilization which are the culmination of their life take place, they should not feel their own existence more intensely and enjoy something like what we call pleasure in ourselves?
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