ABSTRACT
In Cypripedium, the grains of pollen are coated by and immersed in viscid fluid, which is so glutinous that it can be drawn out into short threads. As the two anthers stand behind and above the lower convex surface of the stigma, it is impossible that the glutinous pollen can without some mechanical aid get on to this, the efficient surface of the stigma. The theoretical structure of few flowers has been so largely discussed as that of the Orchideae; nor is this surprising, seeing how unlike they are to common flowers. Robert Brown clearly discusses the homologies of orchids. Five groups of vessels run into the three sepals together with the two upper petals; three enter the labellum; and seven run up the great central column. The author examines the six species namely, C. barbatum, purpuratum, insigne, venustum, pubescens and acaule.
