FLORA OF YORKSHIRE. 4] 
excavations for the marsh and flowering ferns (Osmunda regalis), 
a wall of loose porous stones, or old bricks with a mixture of 
sandy peat or decayed mortar spread between them, will afford a 
congenial site for the smaller rock species, especially those of the 
genus Asplenium. To prevent evaporation, irregular masses of 
stone and cemented brick from the kiln or old furnace may be 
scattered upon the surface around the roots of the ferns. These 
will retain a considerable degree of moisture, and at the same 
time afford shelter to the foliage.” 
As examples of the author’s mode of treating these beautiful 
objects in the vicinity of London (we suppose the author’s col- 
lection is so situated), we refer to his mode of treating the more 
difficult species of the genus Asplenium, A. Ruta-muraria, A. 
Trichomanes, A. viride, and especially A. marinum, pp. 49-56. 
To the student, and especially to the cultivators of the British 
Ferns, we confidently recommend this treatise, as the plainest and 
most practical work which is obtainable on the subject. 
A Supplement to Baines’s ‘ Flora of Yorkshire,’ with a Map. 
Part First : The Flowering Plants and Ferns. By Joun Git- 
BERT BAKER. 
Part Second: The Mosses of the County. By Joun NoweEtt. 
[Second Notice. | 
Before leaving this subject, viz. county or local floras, we may 
advert to the fact, that while some of our counties have several 
floras, as Oxford, Cambridge, York, etc., several have one, as 
Devon, Bedford, Sussex, Salop, and Herts. Many counties have 
none at all, not so much as a list of plants; no modern list, at 
least. We believe Lincoln would repay any resident botanist the 
labour of collecting the facts for a county flora. We are not 
aware that any such are in existence, though its large extent of sea- 
coast, its heaths and open commons, fewer and smaller in extent 
than they were fifty years ago, would probably reward a diligent col- 
lector with many plants of interest, and some probably of novelty. 
We would further state that there are counties in the immediate 
vicinity of the Metropolis, and among these the Metropolitan 
county itself, which have neither flora, nor even lists of plants, 
except the meagre lists in Mr. Gough’s ‘Camden,’ a work not often 
N.S. VOL; I. G 
