Abstract

LETTERS on the occurrence of urease are printed in NATURE of August 11 and September 22. In the former, Prof. Werner reports that he has found urease in all the leguminous nodular growths he has tested; in the latter, Prof. Beijerinck describes how he has detected the enzyme in B. radicicola. Prof. Werner writes: “So far as we have been able to ascertain, the peculiar root nodules of leguminous plants have not hitherto been tested for urease.” I reproduce, therefore, the following passage from an article on “The Function of Hormones in regulating Metabolism,” by my son and myself, published in the Annals of Botany, vol. xxv., No. xcviii., April 1911.

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