On the lateral growth correlations exemplified by petioles and axillaries ofPrisum cotyledons

The cotyledonary petioles in Pisum sativum developing at the start of germination, as well as the cotylaries growing out after decapitation of the Pisuin seedlings manifest very often the so-called lateral correlations, since one of them suppresses the opposite primordium when the growth inhibition in the plant coinciding apparently with the growth promotion results necessarily in a normal development only of one of these originally equal primordia. These correlations also seem to be mediated by auxin, being induced by gravity or by corresponding cotyledon and root products, which can be supported by the use of exogenous auxins.