Sends an extract from J. J. Lalande's article on planets from the Encyclopédie méthodique. Sends two of his own theorems.

Discusses the meaning of C. K. Sprengel’s term "dichogamy". Dichogamous plants are functionally monoecious; Primula is functionally dioecious.

Reports Hermann Crüger’s observations of Cattleya and of bees pollinating Catasetum. Crüger will observe Melastomataceae.

Has built a hothouse.

Fears Amsinckia cannot be dimorphic.

Ill health slows his work on Variation.

Thanks for his opinion; it will save him from exposure, but it is too late to get the book altered. Comments on some parts of JH's book on meteorology. The atmosphere appears to be smaller in extent than John Dalton conceived.