414 ftelations between Geological Strata and 
cabbage, the rock roses, bloody crane’s-bill, &c., Plantago 
Coronopus, and P. maritima, Pyrus Theophrastz, fennel, Xc., 
are common equally to Orme’s Head, Priestholm, and a part 
of Anglesea, which lies exactly opposite these rocks, and forms 
the continuation of the range of mountain limestone. When we 
come to examine the line of greenstone which forms the rocks 
of Caernarvonshire, we find not one trace of these luxuriant 
and beautiful vegetables. 
This contrast is peculiarly striking at Beaumaris. A short 
ride along the north shore of Anglesea, from the town, brings 
you to the limestone range, with ‘abundant traces of its plants ; : 
but on the south side of the town, the picturesque woods of 
Baron Hill skirting the Menai, and forming shelter of every 
kind for vegetables, thére is not enough rs reward even the 
most enthusiastic botanist. The causes may be in the stratum, 
which changes, near Beaumaris, from limestone to sienite and 
trap. The walk from Orme’s Head, along shore, towards 
Abergele, affords a similar contrast. ‘The mountain limestone 
plants prevail more or less, according to situation, exposure, 
and depth of soil, till you leave the range near Llandrillo ; and 
then there appears a new and scanty range of vegetables, the 
products of a sandstone range which crosses from * Llansant- 
freyd, and introduces to the sea-shore the same plants which 
scantily adorn the Conway’s bank about a mile above the 
bridge. These are Glaix maritima, Siléne maritima, and 
Chelidonium Glaticium (the fetid celandine, or yellow horned 
poppy), a singular but disagreeable plant, and forming a 
strong contrast to the delicately tinted and fragrant Thymus, 
marjoram, and milkworts you “leave behind at the descent of 
Pen bach. Convélvulus Soldanélla (sea bindweed) is one of 
the productions claimed by the greywacke formation of the 
Penmonmawr mountains, and denied to the limestone of 
Orme’s Head. It is true that a few specimens may be en- 
countered near Llandudno, but they are seldom seen in a 
flowering state ; and I have never found one seed-vessel of that 
species on the shore opposite the town of Conway, although 
familiar to me from frequent search. ‘The plant, however, 
flowers and produces seed in great abundance, on the level 
tract of shore subtending the cliffs of Penmonbach. It is 
unnecessary to repeat, that the rocks on either shore are quite 
different. 
During the month of July, 1828, I had an opportunity of 
examining ¢ another mountain limestone district, St. Vincent’s 
Rock, and Clifton Downs, near Bristol. In company with a 
* Village of St. Friga, near Conway Bridge. 
