Dec, 1905.] |THE EXTRA-TROPICAL TREES OF ARRAN. 137 
open to me. Two difficulties, however, were before me. | 
had to learn the degree of hardiness of each plant, and I had 
to find out the places where the inclemencies of winter were 
least severe. It might be thought that the latter would be 
easily determined. It is not so. It is easily seen that some 
places are much exposed; but there are others which lie 
nicely to the sun and seem sheltered from high winds which 
most unexpectedly are found to be open to draughts and swirls 
which prove as hurtful as violent blasts. It is frequently 
only by the sad results of experiments that these places are 
determined ; and even an experiment may fail to give the 
desired knowledge, as at times, from some unknown cause, 
a plant may fail, while a second of the same species would 
succeed. 
My experiments began more than forty years ago. Since 
that date several winters have been severe. That of 1894-5 
was specially so. It was after it that my last paper was 
given to your Society (see ‘‘ Transactions and Proceedings,” 
February 1896, pp. 508-531). Since that winter no other 
has been so severe. In mentioning minimum temperature, I 
shall therefore give it of that winter. 
This paper will be devoted to any facts worthy of notice 
overlooked in my previous paper, to the progress made by 
the plants previously mentioned, and to plants introduced 
since that date. Some are passed over because from some 
cause or other they are now gone. Since 1895, at several 
places on the west and south of Arran, and specially at a 
sheltered spot on the side of the highway at Whitefarland, 
on the north-west of the island, interesting experiments have 
been made by Hugh Fullarton, Esq., Glencairn, Greenock. 
In illustration of what the west coast of Scotland is capable 
of growing, there is added to my paper a valuable list ot 
delicate or recently introduced plants which grow at Kinloch 
Hourn, Inverness-shire. For it I am indebted to the pro- 
prietor, Robert Birkbeck, Esq. The capability of the west is 
further illustrated by a list of the numerous plants of the 
bamboo and kindred families which grow wonderfully at 
Achnashie, Roseneath. I owe it to the proprietor, Robert 
Campbell, Esq. 
MeASUREMENTS.—Owing to an attack of internal trouble, 
I have been unable to take the measurements as formerly in 
