4.06 BOTANIZING IN NORTH MIMS. 
borates the opinion that the plants of this Order are destined to 
increase in Great Britain. 
The range of the British eee is very extensive, for this 
will generally be in proportion to the alternations of temperature 
which they will bear; and the range of temperature which a few 
_ of the widely distributed species will bear is between twelve and 
sixteen degrees. Notwithstanding this, there are probably few, or 
any British Orders that contain so large a proportion of local 
plants, or of such plants as have only a very limited range. The ge- 
nerally distributed plants, or those which reach from the southern 
to the northern shores of our island, are scarcely twenty, while 
those that reach from the extreme south to the Murray Frith are 
barely ten more. The local plants, on the other hand, are nearly 
fifty, and many of these are very local. In the south of England 
the most common Crucifere (those of which we have the greatest 
amount of individuals) are the following:—Shepherd’s Purse, 
Common Swine’s Cress, Draba verna, Cardamine pratensis and 
C. hirsuta, Sisymbrium officinale, S. thalianum, Nasturtium offi- 
cinale, Sinapis arvensis, and Raphanus Raphanistrum: these ex- 
tend from the English Channel to the Pentland Frith, and to the 
northern shores of the latter. Sinapis alba, Barbarea vulgaris, 
Sisymbrium Alliaria, S. Sophia, and several of the Nasturtia, 
Cardamine amara, and Arabis hirsuta, etc., are more uncommon 
than the above-quoted species, and they do not extend so far 
north by about three degrees. Some have their north limits in 
Northumberland or Yorkshire, as Huichinsia petrea, Lepidium 
latifoium, Draba muralis, Turritis glabra, Nasturtium sylvestre, 
ete. Several are restricted within narrower limits still, viz. Ey- 
simum cheiranthoides, Diplotaxis muralis, Iberis amara; and some 
still more recent introductions do not extend above two or three 
degrees from the south, scarce reaching to the centre of England. 
There are a few whose range is not more than one or two degrees. 
(To be continued.) 
Results of a few Hours’ Botanizing about North Mims, Hert- 
fordshire and Middlesex. 
To the Editor of the ‘ Phytologist.’ 
A small but zealous band of botanists, of which your humble 
servant formed a part, visited the above-mentioned locality in 
the beginning of June, 1856. One of the party collected Hes- 
