The Molecular Weight of Some Long Chain Salts in Benzene by the Cryoscopic Method.

Studies of this nature may yield additional information which will aid in the proper placement of puzzling genera within the large and taxonomically difficult grass family. Summary.-It is suggested that the two types of root-hair development noted by Sinnott and Bloch within the Gramineae may have important taxonomic significance. Studies with additional genera are reported, and it is revealed that there is a close correlation between the type of root-hair development, the structure of the embryo, leaf anatomy, and size and number of chromosomes. This evidence further emphasizes that anatomical and cytological characters appear to give more certain clues to the true affinities of genera in the Gramineae than do those gross morphological features traditionally used.