RIBUTION OF BRITISH PLANTS. 
UM MERICAL PROPORTIONS OF 5 The Mountains embrace all the s 
š THE ORDERS OF face rising sufficiently high to produce , 
BRITISH PLANTS AT DIFFER- /iz herbacea, Azalea procumbens, 
_ ENT ELEVATIONS. 
By H. C. Watson, Esq. F.L.S. 
In the 3d No. of this Work (p. 86), 
twelve ascending stages of vegetation, in ^ The mean annual temperature of the 
Britain, were exemplified by the upper stages may be stated at 52°—46° 
„lines or limits of trees and shrubs, The plains; for the ascending region we ma 
; estimate it to be 469—399; and for the 
mountains 39°—30°. Ten degrees must. 
paring the numbers in the table: it is to 
in a general way, the change of floral pro- kept in mind, that the species found ont 
ductions seen in passing rSn the low tracts 
of England to the Highland Mountains. 
The 
tained to do so. In addition, the spe- 
cies of some genera, as Salix, Rosa, . 
bus, Myosotis, &c. being so uncertain, 
their distribution so little known, absol 
numbers must be very doubtfully stated. 
About one thousand five hundred . 
Plains in my Remarks on the Distribution 
of British Plants, now in the press ) 
taken, cm up the rest. 
illy thousand four hundred and eighty there : 
racts elsewhere, excepting such higher found on the plains one thousand 
m of the mountains as are referred hundred and thirty-two, in the ascen 
nce of ue stage seven hundred and thirty, and on tl 
1 Imay take Vivas o of this opportunity 
d rea mark, that a line of my MSS. appears to have | 
omitted in setting the types of the Saas 
and so some ambiguity thus introduced. The se 
the genera Quercus, Corylus, (2nd column than : 86) should stand in: the: 
a, and Ulex equally Sepa- in italics being those omitted ; ** the m 
next. E emei to the — the three coldest ‘months aoe San 
of the work 
emt Cows $e 
grees above." 
