Abstract
DUBLIN. Royal Dublin Society, June 16.—M. J. Gorman and H. A. Lafferty: On a method of distinguishing the seedlings of Swedish turnip (Brassica napus L. var. napobrassica (L.) Reichb.) from those of broad-leaved rape (Brassica napus L. var. biennis (Schubl et Mart) Reichb.). Characteristic differences in the shape of the first foliago (‘rough’) leaf and the relative length of first internode are recognisable in the seedlings of these two plants in fourteen to twenty days from the time of sowing the seeds.—T. Dillon and Annie McGuinness: On alginic acid: its mode of occurrence and its constitution. Alginic acid cannot occur in the free state in seaweeds, since no carbon dioxide is evolved during the solution of the fronds of Laminaria in sodium carbonate. Dialysis of alginic acid prepared from fresh fronds gives rise to an increase in the ash-content. This suggests that in the plant the acid is combined with non-polar colloidal compounds of calcium and iron. Dry alginic acid has the formula (C6H8O6); but this is a lactone. The polymerising unit is not an anhydride as in the case of starch and cellulose but the complete acid C6H10O7. The units are therefore not pyranose or furanose rays; but open chains.—M. Grimes and A. J. Hennerty: A study of bacteria belonging to the sub-gonus Aerobacter. The paper describes two species of bacteria previously unknown. These have been named Aerobacter hibernicum and Aerobacter liquefaciens respectively.
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