crossing it until 17 May, by severe snow and rain on 13 May. Continuing northwards they met one of the Voortrekker leaders Andries Potgieter at present-day Potchefstroom in May 1841. Heading further north they made their way to the Magaliesberg entering the Magalies River catchment on 31 May. The Magalies River valley was teeming with game, and they spent 2 weeks shooting and skinning a large variety of mammals and birds, including hippopotamus, black rhino, eland, zebra, kudu, waterbuck and wildebeest. On 12 June they reached the Crocodile River near Hartebeespoort and added to their collection buffalo, tsessebe and crocodile. By now Burke felt that his collection was sufficiently representative and that his wagons were close to capacity. They set off on a trip to the salt pan near Pretoria about two days away. Here they encountered giraffe and a number of birds not previously seen. Burke described this bushveld region as grassveld densely covered with Acacia and other species as far as the eye could see. They had arrived at the southernmost extension of African savanna in the interior. Burke left the salt pan on 7 August and returned to their Magaliesberg camp, and on 24 August headed west to Marikana and Sterkstroom. They followed this stream north as far as its junction with the Crocodile River, which they reached on 29 August, and at which place they shot their first white rhino. They followed the Crocodile further north to the Pienaars River confluence, reaching the most northerly point of their expedition. Burke recorded that the area was teeming with rhino and lion; they made camp here and stayed for several weeks, collecting numerous specimens and live young animals. On 26 October they broke camp and moved east, following the Pienaars River, almost to the salt pan they had visited previously. They thereupon returned to their camp in the Magaliesberg and on 17 November received a visit from the Swedish naturalist Wahlberg, who had journeyed up from Port Natal. They made a few minor excursions before starting on the return journey on 14 December 1841. Following the course of the Magalies River upstream, they reached Potchefstroom on 26 December and came across an Erythrina (most probably E. zeyheri Harv.) in full flower. This species is remarkable in that it is in effect an underground tree which only appears above ground during the flowering season, spending the winter months in