MORPHOLOGICAL PECULIARITIES OF LINARIA SPURIA

IN all the natural history sciences there occur series of changes, systematic, governed by definite laws, growing out of a kind of development, and leading by successive steps to entire modifications, more or less important, in the general economy of nature. Thus among insects we have the change from the grub to the chrysalis, and from that to the butterfly or beetle. Among plants, the conversion of leaves into petals, or petals into stamens, may be mentioned as examples.