NEW PUBLICATIONS. 221 
published a pamphlet containing a physical description and Florula of the 
_ district round Han-sur-Lesse, a small, but botanically very rich, tract 
of low hilly country on the confines of Namur and Luxembourg ; and 
now, in the pamphlet the title of which stands at the head of this 
notice, he asks us to traverse with him and note the plants of the 
more mountainous tract which occupies the south-eastern portion of 
the kingdom. 
The district which he includes is bounded partly by natural and 
partly by conventional limits. The Ardennes are the chain of hills 
which form the termination, in a western direction, of the mountain 
barrier which bounds the great Germanic plain upon the south. 
the east this barrier begins with the Carpathians, and it extends from 
east to west by way of the Sudetes, the Riesengebirge, the Erzgebirge, 
` the Thüringer-wald, the Taunus, the Eifel, and then it enters Belgium. 
M. Crepin does not anywhere extend the limits of his district beyond 
the Belgian frontier in a south-eastern direction, and on the north-west 
he fixes his boundary at the line where the Silurian rocks of the hill- 
country cease, thus obtaining a tract which, so far as Belgium is con- 
cerned, has a well-marked physical character of its own, and is separated 
from the rest by well-marked physical peculiarities. It includes the 
greater part of the province of Luxembourg, and small portions of 
those of Liége, Namur, and Hainault. It is a tract of slate hills, 
amongst the beds of which various bands of arenaceous composition 
are intermixed, but entirely without limestone. Passing from the 
Ardennes towards the south-east, we have first New Red Sandstone and 
_ afterwards Lias and Oolite. Passing from it towards the north-west, 
we have Permian beds and Carboniferous limestones, but none of these 
‘are included, The highest peak attains an elevation of about 2200 
English feet. It is a well-irrigated region, watered by branches of the 
Meuse and the Rhine. The principal tributary of the latter is called 
the Sure, which joins the Moselle at some distance from the hills. The 
Meuse flows from south to north, and its principal branches are the 
Semoy, the Lesse, the Homme, the Ourthe, and the Amblève. 
“ Ascending,” he writes, “from the smiling valleys of the country 
between the Sambre and the Meuse, we are astonished, when we climb. 
the elevated points of the Ardenne chain, at the entirely different 
aspect of the country, which is often strikingly desolate and severe in 
appearance. In the midst of those wide bare moors, with their sombre 
