AGKNOWLEDGMENTS. hii 
Gibraltar, and elsewhere, he has never lost his keen 
interest in the flora of his native county. From Dr 
Fortescue’s list one can see that the Colonel was a 
recognised authority on Orkney plants many years 
ago. Utricularia minor was one of his earliest dis- 
coveries. There are several Hieracia, Ranunculaceae, 
and other rare plants justly credited to his name. 
He has recently greatly increased my obligations to 
him by sending me lists of all his latest “ finds.” 
Some of these, I regret, have come too late to find 
their proper place under their various orders; so that 
we have to be satisfied with adding them as an 
appendix. 
JOHN §S. Fuerr, D.Se., LL.D., F.B.S., Director of 
the Geological Survey of Scotland, has given me 
valuable help in addition to what I have already 
acknowledged. He has written a very able and 
interesting paper for this “Flora” on the geological 
structure of the islands, and the re-introduction of 
their flora after their entire denudation by the ice 
sheets of the Great Ice Age, and subsequent changes. 
All botanists and geologists who read this paper will, 
I feel sure, be grateful to him for expressing in clear 
and simple language his interpretations of an intri- 
cate and difficult subject, and making it readable 
and intelligible. 
Mr WituiamM McKay, J.P., F.E.LS., and Mr Jonn 
FirtH, Finstown, drew up a very interesting list of 
plants which were at one time used medicinally in 
Orkney. This list, with the additions sent by Mr 
