To Lyell’s chagrin, CD has come round again to A. C. Ramsay’s glacial theory.

On primrose and cowslip, CD maintains they are good species, notwithstanding Scott’s work.

CD defines species by power of remaining constant for a good long time and showing appreciable amount of difference from close species.

Notes introduction of 'Worthytype' process into commercial photography. Calls attention to process discovered by JH in 1832 for purifying uranium.

Describes a method created by JH [see JH's 'Lettre ... sur ... un nouveau procédé pour effectuer la purification complète de l'oxide d'urane,' Annales de chimie, 49 (1832), 306-11] for obtaining pure uranium.