"You will have been sorry to have seen in the newspapers, the disturbances & fightings with the New Zealanders. – I have lately been much interested in reading your chapters on the slow decrease in numbers … of these poor people. The case appears to me very curious, especially as the decrease has commenced or continued since the introduction of the potato – the relation between the amount of population & of food is hence inverted. It would have been a case for the great Malthus to have reflected on".

More on confused systems of star magnitudes used by Thomas Henderson.

Comments regarding the proposed revision of the constellations.

Description and defence of his view of the tosca in Banda Oriental, along the Rio Uruguay and at the Rio Negro, taking issue with A. D. d’Orbigny. Refers to the pumice in the Patagonian Territory. Two tables show the layered tosca formation along the Uruguay.