Has been working hard on collecting English and foreign birds. Yarrell has written of new birds discovered in England.

News of work in progress by Leonard Jenyns, P. J. Selby, and John Gould.

Cautions CD to beware of insects when he sends any birds’ skins – otherwise there will be only feathers, beaks, and legs remaining when he returns.

Is sending a cargo of specimens – birds’ skins, small quadrupeds, and fossil bones.

Describes his overland trip from Rio Negro to Buenos Aires and his expedition to Santa Fé.

Asks for mineralogical works to help him with the volcanic rocks of the west coast.

Thanks CM for his communication about the aloe. JH and family are about to embark for the Cape, and JH will keep CM's interests in mind while there.

Addresses last words before departing to Cape. Informs AQ that results concerning absorption of light will be in next London and Edinburgh Philosophical Journal. One will be sent to AQ. Reminds AQ of promise to write JH at Cape.

Waiting for the ship to be repaired. Has sent him his paper on satellites. Would like 100 offprints. Just about to go on board ship.