670 



and subsequently treated like the potashes. In every case the pro- 

 cess used for the liberation of iodine is that suggested by Dr. Price, 

 viz., nitrite of potassa and hydrochloric acid ; and in many cases 

 where no indications of iodine could be obtained by the ordinary me- 

 thods good results were procured with Dr. Price's process. 



In the following plants, hitherto unknown to contain iodine, Mr. 

 Macadam has detected that element : — Myosotis palustris, Mentha 

 sativa, Menyanthes trifoliata, and Equisetum limosum (Duddingstone 

 Loch), Ranunculus aquatilis, Potaraogeton densus, and Chara vulga- 

 ris (Dunsappie Loch). 



The author has also confirmed the presence of iodine in the follow- 

 ing plants, in which it had been previously found by other observers ; 

 the specimens, however, are from different localities: — Iris Pseud- 

 acorus, Phragmites communis (Duddingstone), and in the ashes of 

 coal. 



As having some connexion with the subject treated of, the author 

 intimated that he had obtained distinct indications of the presence of 

 bromine in the crude potashes. It is unfortunate that our tests for 

 bromine are so much inferior in delicacy to those of iodine, that it is 

 necessary to operate upon very large quantities before the tests are 

 distinct. There is no doubt that, from its presence in trees, it will be 

 found in greater abundance in the more succulent plants ; but the few 

 trials yet made have been unsuccessful in determining its presence in 

 any but the crude Canadian and American potashes. 



The experiments (excepting those pursued in the open air) were 

 conducted in the laboratory of Dr. George Wilson, to whom the au- 

 thor feels deeply indebted for the kind manner in which he has 

 afforded him every assistance in his power during the whole course 

 of the investigation. 



Localities of Rare Scotch Plants. 



Professor Balfour noticed the following localities for rare Scotch 

 plants observed by him during his trips this season, viz. : — 

 Nuphar lutea. Loch near Dunfermline. 

 Trollius Europceus. Hill of Knock, near Dunfermline. 

 Teesdalia nudicaulis. Braid Hills (George Morris). 

 Nasturtium palustre. Banks of Tweed, Gladswood, near Melrose. 

 Viola hirta. Gladswood, Melrose. 

 Malva moschata. Gladswood, Melrose. 

 Geranium nodosum. Banks of Tweed. 

 Euonymus Europaus. Gladswood. 



