CONTENTS. 
XI. A Commentary on the Fourth Part of the Hortus Malabaricus. By 
(the late) Francis Hamixron, M.D., F.R.S. and L.S. . . page 147 
XII. Memoir on the Degree of Selection exercised by Plants, with regard to 
the Earthy Constituents presented to their Absorbing Surfaces. By 
CnaanLEs Dauseny, M.D., F.R.S. L.S. G.S., &c., Professor of Botany 
and Chemistry in the University of Oxford . . . . . . . . 253 
XIII. Review of the Order of Hydrophyllee. By Georce Bentuam, Esq., 
GELS. . . . |. eae ee 0. ee 
XIV. On Diopsis, a Genus of Dipterous Insects, with Descriptions of Twenty- 
one Species. By J. O. Westwoop, Esd., F.L.S. . . . . . .283 
