In the case of that curious genus of plants the Sarracèn_ia_, in which the S. adúnca is most conspicuous, the foliaceous pouch is a mere reservoir, or cistern, to catch and retain the falling dew or rain. In the _N_epénthes distillatòria, or pitcher plant, the case is different; and analysis proves it to be an evident secretion from the plant itself, independent altogether of the fact that it is found in the pitcher before the lid has yet opened. I may here state, _en passant,_ that the results, I obtained from a chemical examination of this liquid differ materially from those of Dr. Edward Turner. The _C_órnus máscula is very remarkable for the amount of fluid matter which evolves from its leaves, and the willow and poplar, when grouped more especially, exhibit the phenomenon in the form of a gentle shower. Prince Maximilian, in his _Travels in the Brazils_, informs us that the natives in these districts are well acquainted with the peculiar property of those hollow leaves that act as recipients of the condensed vapours of the atmosphere; and, doubtless, these are sources where many tropical animals, as well as the wandering savage, sate their thirst "in a weary land." The Tillánds_ia_ exhibits a watery feature of a different complexion: here the entire interior is charged with such a supply of liquid, that, when cut, it affords a copious and refreshing beverage to man. That these extraordinary sources of "living springs of water" are not unknown to inferior creation, is a fact interestingly confirmed to us in the happy incidents detailed by Mr. Campbell, in his _Travels in South Africa_, where a species of mouse is described to us, as storing up supplies of water contained in the berries of particular plants; and, in Ceylon, animals of the _S_ímia tribe are said to be well acquainted with the _N_epénthes distillatòria, and to have frequent recourse to its pitcher. The mechanism of the "rose of Jericho" (Anastática hierochuntìna] shows the susceptibility of plants to moisture in a very remarkable manner; and I have submitted some experiments made with this extraordinary exotic, the inhabitant of an arid sandy soil, to the Horticultural Society of London. That succulents should be found clothing in patches the surface of the burning desert is a phenomenon not the least wonderful in the geographical history of vegetation.