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course lay, a narrow valley bounded by rocks of Carboniferons limejitone, 

 frequently much contorted, -while their jagged and angular outlinea, tell of 

 some other force than mere erosion by water having had to do with their 

 present abrupt configuration. The slopes are richly clothed with wood, 

 while the river winds through a green pastoral valley, never, probably, much 

 more than half a mile in width, and for the most part far leas. We crossed 

 the Lesse three times at fords, which were sufficiently deep to aamit the 

 water into the carriage. About 2^ miles from Dinant the road passes under 

 the Castle of Walzin, which stands on the summit of a bold rock immediately 

 above the stream, and presents a most picturesque appearance. Thence to the 

 village of Challeux is about 2.] miles of execrable roads. Here we descended 

 from our carriage and made onr way to the river at this point, deep and 

 still. A shout of recognition was esohanged, and presently a narrow fiat- 

 bottomed shallop was poled across to convey us to the opposite side of the 

 stream, where a long talus of broken earth and stones showed where operations 

 were being carried on. A course of steps cut in the hill side led up the slope, 

 at the top of which we found ourselves in front of a yawning cavern, and in 

 presence of a gentleman in the dress of an excavator. The latter was Dr, 

 Dupont, and the cave that of Nauktte, in which was found the now famous 

 human jaw, associated with Rhinoceros tichorimts and other extinct mam- 

 malia. Dr. Dupont welcomed us with cordiality. Armed with lights, we 

 entered the cave, from which large quantities of material had been removed. 

 Dr. Dupont explained the chracteristics and relations of the so-called " Lehm" 

 and "Loess." The latter he considers to be marine, and shows that the jaw 

 Tvas found in the former, under at least seven feet of "Loess" sands. The 

 position of this jaw has been disputed ; but there were too many persona 

 present at the time of its discovery to admit of any doubts on the subject ; 

 its exact position is determined without room for cavil. We were a queer 

 looking set as, with wolf-skins over our shoulders to shield our coats from 

 the wet and clay, we emerged again into the light of day. 



From Naulette we proceeded to the " Trou du Frontal" and the "Trou 

 des Nutons." By-the-way we halted at the little hamlet of Challsux, quite 

 a little republic of its own in this remote out of the way spot. It is most 

 pleasingly situated on the banks of the stream, embosomed among trees, and 

 having opposite, bold limestone cliffs— in which is a bone cave called the 

 cave of La Challeux -which in the number and variety of the remains it has 

 yielded, is surp<vssed by none in the valley. Unfoitunately we did not 

 examine this cavern, being hurried on by our guides, and it was not until 

 afterwards that we were made aware of its importance. In less than a mile 

 the carriage again came to a halt, at the nearest approachable point to the 

 Trou du Frontal, and the Trou des Nutons. The way lay through a dense 

 woody jungle, in which all trace of a track was nearly obliterated. These 

 were the first opened, and the " Trou du Frontal " received its name from 

 the frontal or forehead bone of a human being, the first which was discovered 



