The main stages in the history of soil humus study; Contemporary ideas on the composition of soil organic matter and the nature of humus substances; The biochemistry of humus formation; The importance of organic matter in soil fromation and soil ...

The mode of occurrence of carotenoids in plants and animals. The detection and estimation of carotenoid pigments. The formation of carotenoids in plants and their physiological significance. The isolation of carotenoids. The chemical constitution ...

Includes the Proceedings of the 30th- (1913- ) annual convention of the association.

Includes the Proceedings of the 30th- (1913- ) annual convention of the association.