Dr Graham's Botanical Excursion. 315 



the ground where Miss Robertson has this summer found it.— Triticum 

 loliaceum. — North Queensferri/, Dr Dewar. I am not aware that this plant 

 has been mentioned as native of the west of Scotland. We found it in 

 much greater abundance than I ever before saw it to grow, in many places 



along the south shore of Galloway, from Drummore eastward. Tulipa syl- 



restris, — Observed this spring near Edinburgh, in a field which certainly 

 never had been cultivated. If brought there by accident, it must have 



been many years ago, for it now forms a large dense patch Veronica 



I Buxbaumii. — Near Dunfermline', near Inverkeithing, Dr Dewar. I have 

 not seen either station, but am inclined to believe with Dr Dewar that it 

 has not been introduced, because it has only been lately cultivated, and 



probably it has not been so yet, near either of these stations. Viola fla- 



vicornis — In several stations near Edinburgh, abundantly. First observed 

 by Mr Forbes. 



After returning from Galloway, I went with Sir William J. 

 Hooker to Ben Lawers, and the mountains in the vicinity of 

 Killin. The alpine plants were in worse condition than I ever 

 saw them — no doubt in consequence of the singular and parti- 

 cularly bad weather of this summer (as in courtesy to the season 

 it must be called), during which warmth and perfect drought 

 prevented vegetation in May, and cold, rain, and wind destroy- 

 ed it in July. ^ 



Proceedings of the Royal Society of Edinburgh. 



1836, March 91st. — Rev. Dr. Chalmers, Vice-President, 

 in the Chair. The following Communications were read : 



1. Observations and Experiments on the Coloured and Co- 

 lourable Matters in the Leaves and Flowers of Plants, 

 particularly in reference to the Principles upon which 

 Acids and Alkalies act in producing Red and Yellow 

 or Green. By Dr Hope, V. P. R. S. E., F. R. S. [Con- 

 tinued from 18th Jan.] 



After premising some general remarks respecting the object of 

 research, and enumerating the various authors who had written 

 upon the subject, Dr Hope explained various terms which were to 

 be used in the discourse. To the various coloured matters pre- 

 sented by the leaves and flowers of plants, De CandoUe bad ap- 

 plied the denomination of Chromule, which term he meant to adopt. 



There resides in the same parts of plants, in addition to the chro- 

 mule, some matter probably destitute of colour, which becomes red 

 by the action of acids, and yellow or green by the action of alka- 

 lies. To it Mr Ellis gave the name of colourable matter, which the 



