pneumococcus too, several different chemical molecules. But attempts to restore the former and 306,c00 from the disintegration of the heteropolar type the re- mains a problem, that efforts had previously been carried out. In the meanwhile the work of Prof. H. S. Hartley, Diseases of Glasshouse Plants (1923). AGRICULTURE tropical plants used for the end of 1920, when the early statements of applications of calciurn carbide for generating the