Kidneys of birds, [144].
Kirby on tarsi deficient in beetles, [135].
Knight, Andrew, on cause of variation, [7].
Kölreuter on the barberry, [98].
—— on sterility of hybrids, [246].
—— on reciprocal crosses, [258].
—— on crossed varieties of nicotiana, [271].
—— on crossing male and hermaphrodite flowers, [451].
L.
Lamarck on adaptive characters, [426].