It appears, however, from his son Isidore's "Vie, Travaux etc., d'Etienne Geoffroy Saint-Hilaire," Paris 1847, page 214, that the law was given in his "Philosophie Anatomique," of which the first part was published in 1818.

Darwin (ibid.) gives some instances of the law holding good in plants.), as applied to plants?
I am well aware that some zoologists quite reject it, but it certainly appears to me that it often holds good with animals.
You are no doubt aware of the kind of facts I refer to, such as great development of canines in the carnivora apparently causing a diminution--a compensation or balancement--in the small size of premolars, etc.

I have incidentally noticed some analogous remarks on plants, but have never seen it discussed by botanists.

Can you think of cases in any one species in genus, or genus in family, with certain parts extra developed, and some adjoining parts reduced?
In varieties of the same species double flowers and large fruits seem something of this--want of pollen and of seeds balancing with the increased number of petals and development of fruit.

I hope we shall see you here this autumn.
(24/1.