1858.] THIllSK NATURAL HISTORY SOCIETY. 561 



I noticed Mnium serratum, Hypnum murale, H. rivulare, and 

 Veronica montana, and, upon stones in its bed, Cinclidotus fon- 

 tinaloides, and Hypnum fluviatile. 



" After effecting an establishment at Ilkley, I went up in the 

 evening to explore Rumbald's Moor. Above Ilkley the bank is 

 so thoroughly characteristic of the gritstone, that I will endea- 

 vour to describe it for you. The extreme summit of the ridge 

 is 1300 feet high, but that is over away towards Airedale, and the 

 hilltop here is not more than 700 feet above the bottom of the 

 valley (1000 feet in all), and sinks into it by a gradual descent. 

 The crest is marked by an irregular line of scar -like edges of 

 gritstone, huge boulders and debris of which are piled about in 

 picturesque confusion immediately beneath the edge, and scat- 

 tered more sparingly far down below towards the bottom of the 

 valley. The stone is of moderate coarseness of grain and average 

 firmness of consistency. As in all the gritstones, the blocks 

 look corrugated and unshapely, pitted and channelled by the 

 agencies of time and weather, and are stained with brown and 

 golden-hued Lecidece, and variegated with grey patches of Par- 

 melice and fringe-like tufts of Evernia jubata and furfuracea. 

 Towards the ground, and on their shaded sides, are to be met 

 with such Mosses and Hepaticae as Hypnum cupressiforme and 

 denticulatum, Jungermannia albicans, Dicranum heteromallum and 

 fuscescens.. The hillside is coated mainly with a brown covering 

 of Ling and Bilberry, Heath and Crowberry, thick, swelling in the 

 hollows, stunted and rough on the undulated knolls, margined 

 with grassy turf where the ground is drier and the rocks more 

 thinly clad with earth. The damper plashes are marked by a dense 

 growth of Aulacomnionpalustre, Leucobryum glaucum, and various 

 Sphagna ; and numerous tiny v/atercourses, edged with Stellaria 

 uliginosa and Montia font ana, trickle through thick masses of 

 dark-green Hypna, Brya, and Bartramics, and these converge gra- 

 dually towards a little gill, at the bottom of which a streamlet 

 makes its way down the descent, now forcing a road between a 

 narrow channel of rocks, the luxuriant covering of which almost 

 .hides it from the face of day, now leaping with foam and bubbles 

 over a Moss-fringed stone that would interpose to bar its pro- 

 gress, and ever and anon spreading out into a more open channel, 

 and rippling noisily over the scattered pebbles. In the way of 

 rarities the stream yields abundance of Hypnum flagellare and 



N. S. VOL. II. 4 c 



