For an account of work of this character, see papers by G.Bonnier in the "Revue Generale," Volume II., 1890; "Ann.

Sc.

Nat." Volume XX.; "Revue Generale," Volume VII.), viz., to get seeds of some alpine plant, a little more hairy, etc., etc., than its lowland fellow, and raise seedlings at Kew: if this has not been done, could you not get it done?
Have you anybody in Scotland from whom you could get the seeds?
I have been interested by your remarks on Senecia and Gnaphalium: would it not be worth while (I should be very curious to hear the result) to make a short list of the generally considered variable or polymorphous genera, as Rosa, Salix, Rubus, etc., etc., and reflect whether such genera are generally mundane, and more especially whether they have distinct or identical (or closely allied) species in their different and distant habitats.
Don't forget me, if you ever stumble on cases of the same species being MORE or LESS variable in different countries.
With respect to the word "sterile" as used for male or polleniferous flowers, it has always offended my ears dreadfully; on the same principle that it would to hear a potent stallion, ram or bull called sterile, because they did not bear, as well as beget, young.
With respect to your geological-map suggestion, I wish with all my heart I could follow it; but just reflect on the number of measurements requisite; why, at present it could not be done even in England, even with the assumption of the land having simply risen any exact number of feet.

But subsidence in most cases has hopelessly complexed the problem: see what Jordanhill-Smith (16/2.

James Smith, of Jordan Hill, author of a paper "On the Geology of Gibraltar" ("Quart.