"From Curico we went to Talca, a considerable town, and thence explored the river Maule, with a view to its capabilities for navigation. We returned by Curico to San Fernando, where we re-entered the Cordillera by the valley of the Tinguiririca to ascend the pass of Las Damas: the road was very similar to that we had previously descended from the Planchon to Curico; but, being much less frequented, it was in many places difficult and dangerous. In the upper part of this valley we examined some hot springs, the temperature of which reached 170° of Fahrenheit. Thence we were induced to devote two days to visit a volcano,--which was described to us as being in an active state,--about ten leagues distant: thither we proceeded by a most rugged and dangerous path, and reached within half a league of the summit, when so serious a snow-storm came on, that we had the mortification of being forced to return without accomplishing our object; nor had we any time to lose, for the snow had so completely obliterated all traces of the way, that our guide was completely lost, and, but for the observations I had taken with my compass, I know not how we should have got back at all. On reaching our mules again, the weather was so unpromising that we made all haste to recross the mountains, lest they should be closed against us by the heavy snow which was falling; this we happily accomplished, and three days brought us back again to the place where we had first crossed the Atuel river. After visiting the extensive saline lakes in that vicinity, from which the province is supplied with salt, we bent our way back to Mendoza. "In this journey I had an opportunity I had long desired of examining on the Cordillera the plant from the root of which the natives of Chile obtain their admirable red dye." Dr. Gillies, the writer of this letter, passed many years at Mendoza, where he recovered from a severe pulmonary affection, and was himself a striking instance of the beneficial effects of the climate under such circumstances. Botany was his favourite pursuit; but he did not confine himself to this, and never lost an opportunity of collecting useful information on every other point which fell under his notice.