that insects from this land penetrated into various parts of England. 

 Subsequent changes in climate would lead to their confinement to 

 restricted localities or to their disappearance, just as heather and juniper 

 now seem to be dying out in this part of the world. On the other hand 

 there seems to be a tendency for some species to invade the district 

 from the southwest, for a year or two, for a longer period, or even perm- 

 anently. 



Of special importance is the nearness of this part of Kent to the 

 coast of France. The Channel is, from the geologists' point of view, a 

 modern institution, and for a long period the insect world must have 

 found here the front door of England. Even now twenty odd miles of 

 sea present no great obstacle to strong fliers, and their weaker brethren 

 are often carried over by the wind. Hence we have many visitors from 

 abroad, some originating from as far away as Southern Europe, North 

 Africa, or the Levant. Some, for instance the Red Admiral, the Painted 

 Lady, and the Clouded Yellow butterflies, are easily recognised as 

 visitors, for they rarely or never survive the winter; some manage to 

 breed here and linger for three or four years ; and some, such as Vine's 

 Rustic, the White-banded Carpet, and the Yarrow Pug, seem to have 

 settled down permanently in quite recent years. Apart from such 

 migrants it is reasonable to suppose that there is a regular interchange 

 between the two countries of more ordinary species.* 



THE DOWNS : A LOCAL WALK 



Walking Distance : 4 Miles 



ll^or a splendid walk along the Downs which overlook Folkestone 

 from the north, it is best first to take the No. 90 bus from Bouverie 

 Square up the long ascent of Dover Hill, the road winding up the steep 

 scarp face of the Chalk, to the " Valiant Sailor." Opposite this irm, 

 Crete Road runs inland, past two cottages, along the rim of the scarp. 

 The first half mile lies over the ochre coloured Lenham sands, capping 

 the chalk and the hillside is thickly covered by gorse. The attractive 

 view to the southwest is also very interesting geologically in that it over- 

 looks some of the older rocks of the eroded Wealden anticline. Along 

 the foot of the hill lies the Gault clay, with its evidence of brickfield work. 

 The town of Folkestone has largely developed on the next oldest strata, 

 the Lower Greensand beds. These sandstones, which can be easily 



"Reproduced from Folkestone— Past and Present, price 2/6d., by kind 

 permission. 



12 



