Concerned to hear of Smith's indisposition; it has been agreed he appears tonight as Smith's substitute, though on a general topic and not botany; will inform the audience Smith hopes to lecture on Monday.

Owing to lack of sleep, "continual fever & headache", and affection of his lungs unable to lecture tonight, but will be able to on Monday; asks Yates or Mr Corrie to lecture instead or to give some kind of notice. Will be able to make up the full course but will have to give up all dining, calling, and talking. Anxious that nothing should be said of his indisposition.