14 Transactions. 
short and the weather very unfavourable, I was still able to note 
some interesting facts which may perhaps be of some use. First, 
with regard to the botanical districts of the county, it is instruc- 
tive to compare our flora with that of Derbyshire, which has been 
¢well worked out by Mr Baker. In Derbyshire Mr Baker found 
the limits of Watson’s zones to be as follows :—Infragrarian zone 
ending at 450 feet, the midagrarian at 1050 feet, and the super- 
agrarian at 1650 feet. I found, however, Rubus Chamemorus, 
which marks the upper limit of the superagrarian zone, constantly 
appearing (on Pikethow, Causey Grain, MoodlawLoch, and near 
Moffat) at a height of 1450 feet; that is to say, 200 feet lower 
than it usually begins in Derbyshire. This is readily explained 
by the difference in latitude. In Mr Lees’ “Flora of West 
Yorkshire” the manner in which the zone limits “dip” or 
diminish in height as one travels north is very clearly brought 
out. Assuming, then, 200 feet as the difference due to the lati- 
tude, we should have 250 feet, 850 feet, and 1450 feet as the 
limits of Watson’s zones in Dumfriesshire. Were this the case, 
the flora of the lowest region should extend up the Nith to 
Drumlanrig, up the Annan to the junction of Wamphray water, 
and as far as Langholm along the Esk. I think, however, that 
these limits will turn out rather too high. Probably infragrarian 
plants will not extend so far north as this, though a good portion 
of the county will still le in this zone. The limits of the mid 
and superagrarian zones I could not manage clearly to trace out, 
but the largest portion of Dumfriesshire is certainly under 850 
feet in altitude. There is, however, a very distinct arctic flora 
which begins about the level of 1450 feet, and so far as I could 
judge appears with regularity at that height, that is, when soil 
and rock conditions are favourable. 
This arctic flora contains such plants as—TZhalectrum, Coch- 
learia officinalis, Cerastiwm alpinum, Rubus chamcmorus, all the 
Sawifrages except S. granulata, Sedum Rhodiola, Epilobvuwm 
alsinefolium, Saussurea alpina, Hieracium iricum, and argen- 
teum ; Ajuga pyramidalis, Polygonum viviparum, Avena alpina 
Sm., Carex atrata and C. capillaris, Poa Balfourii, Cystopteris 
fragilis, &c. Whether, however, the superagrarian flora extends 
into the ground of this arctic flora or not is a more difficult ques- 
tion to answer. J have found almost all the commoner forms of 
this (superagrarian) flora by the sides of small streams and in 
