ee eee 
OF TREES AND SHRUBS. 89 
Solanum Dulcamara . 4.Norway 
Daphne Laureola .... 3.Belgium 
pee binds 2. Nordland 
EPA EL. 6. Norway 
Cem Fees IST, 5. Norway 
Corylus Avellana .... 6.Norway 
Betula alba ......... 9. Greenland 
tang ........ 0.NW.AmO7—71 
Alnus Glutinosa ..... 6.Sweden 
Populus tremula ..... 7.Finmark 
. ENDE Loo. 3. Sweden ? 
ee- eunescens..... 2. Berlin 
mee HOTR 2. sus 3. Sweden? 
Salix roe incdus .12. Spitzbergen801 
reticulata ...... 10.Port Bowen 
Myrica Gale ........ 7. Nordland 
Pinus sylvestris... ... 8. Finmark 
Juniperus communis .. 9. Greenland, 66 
Taxus baccata ....... 4.Norway 
Empetrum nigrum .. .10. Greenland, 71 
Ruscus aculeatus .... 3.France 
INTRODUCED, OR DOUBTFUL AS NATIVES; 
BUT PLANTED IN ENGLAND AND SCOT- 
LAND. 
Tilia BETORÉÉ. ee Berlin 
i pireeha ......... Norway ? 
e grandiohla......... Berlin 
Acer Pseudo-platanus .. . Belgium 
S aigba pinnata ...... Belgium 
nus domestica ....... Sweden ? 
m a n Baltic 
Spirea salicifolia ....... Norway 
Mespilus Germanica. . . . Berlin 
Pyrus domestica ........ Germany 
Tamarix Gallica ........ France 
Pibes Grossularia.......Sweden? 
deeem opa. ... Germany 
Daphne Mezereum ...... Nordland 
Buzus sempervirens ..... Holland ? 
Ulmus suberosa, $c. ..... Norway ? 
Fagus sylvatica. ........ Norway 
nea vulgaris....... Holland 
sue Betuha.. ...... Sweden 
CEU E MUR Wig epe uri uice de iq e Rs 
The general agreement between the or- 
der of cessation on the hills of Britain and 
towards the Arctic Regions, in a North- 
west direction, is sufficiently obvious; but 
perfect similarity could not be expected, 
and does not exist. Yet it appears to be 
not improbable that increased knowledge 
of actual distribution will bring the coinci- 
dences still closer, and explain, if not re- 
move, some of the apparent exceptions. 
Saliz herbacea exceeds every other shrub 
in Britain; it also exceeds every other 
British shrub in northern latitude. Vac- 
cintum Myrtillus and V.uliginosum occupy 
the next stage below ; both pass the Arctic 
Circle, but the progress of the former to- 
wards the North-west is arrested sooner 
than could be expected from its altitude in 
Britain. Vaccinium Vitis-Idea, Arbutus 
alpina, Azalea procumbens, Salix reticu- 
lata, Empetrum nigrum attain the tenth 
stage in Scotland; and all these pass the 
Arctic Circle on the coast of America, or 
adjacent islands. In the ninth stage we 
meet with larger species, and belonging to 
other Natural Orders, Pyrus Aucuparia, 
Calluna vulgaris, Betula alba, B. nana, 
and Juniperus communis (nana.) All 
these occur in Lapland, beyond the Arctic 
Circle; but in a North-west course from 
Britain, towards inferior climates, that is, 
Circle, with the exception of Betula nana ; 
but this shrub is arrested in Scotland much 
earlier than could have been anticipated 
from its position on the mountains of Lap- 
land. The same sort of resemblance in 
terminal lines runs through the stages ; and > 
at length in the lowest, or South of Eng- 
land, we find four shrubs terminate, three 
of which do not reach the Baltic; Genista 
pilosa, however, attains to Sweden, and 
thus forms an exception on the opposite 
side to the other shrubby Leguminosae, 
eh rise to highen pure in abot than 
limits 
in Europe; "bat ud us Genista pilosa is 
very local, and hence, like Betula nana, 
unadapted or com son, 
uli is highly probable an a of the npu : p 
