15d 23' E.) Frequent rains had fallen in October and November, which were nearly always accompanied with thunder.

Occasionally the quantity of moisture in the atmosphere is greatly increased without any visible cause: this imparts a sensation of considerable cold, though the thermometer exhibits no fall of the mercury.

The greater humidity in the air, affording a better conducting medium for the radiation of heat from the body, is as dangerous as a sudden fall of the thermometer: it causes considerable disease among the natives, and this season is denominated "Carneirado", as if by the disease they were slaughtered like sheep.

The season of these changes, which is the most favorable for Europeans, is the most unhealthy for the native population; and this is by no means a climate in which either natives or Europeans can indulge in irregularities with impunity.
Owing to the weakness of the men who had been sick, we were able to march but short distances.

Three hours and a half brought us to the banks of the Caloi, a small stream which flows into the Senza.