66 Proceedings. 



Paint Pot Basin" is remarkable for the varied shades of 

 colour of the mud-holes, green and red being most prevalent. 

 In the Lower Geyser Basin (7250 ft. above the sea) is the 

 Fountain Geyser, which spouts twice a day. The Midway 

 Geyser Basin contains the Excelsior Geyser, the largest in 

 the world; it "plays" twice a day, rising to a height of 

 300 ft. in a column 75 ft. in diameter from a pit 300 ft. by 

 200 ft., and 20 ft. deep; the noise and commotion can be 

 heard at a distance of two to three miles. 



Towards the S.E. of the Park is the Yellowstone Lake, at 

 an elevation of nearly 8000 ft. above the sea-level. Its area 

 is about 150 square miles. It is surrounded by dense Pine- 

 forests, and the islands in the lake are thickly wooded. Trout 

 are prodigiously abundant ; they are subject to a parasitical, 

 intestinal worm, which eats into the flesh. In the month of 

 June Mr. Christy found the Mosquitos almost unendurable. 



Within five miles of the Lake is the Natural Bridge, which 

 spans a mountain-gorge. Some miles below the Lake the 

 Yellowstone Eiver rushes over the Upper Falls, 112 ft. in 

 height ; and half a mile further on its course takes a plunge 

 of 300 ft. over the Lower Falls down into the depths of the 

 Grand Canon, a gorge twenty-one miles in length cut by the 

 river out of volcanic rock. Its walls are brilliantly coloured, 

 and afford nesting-places for Eagles and Ospreys. 



On the side of the Amethyst Mountain, on the east fork of 

 the Yellowstone Eiver, are fossil forests. Some of the trees 

 are standing in situ, and are a yard in diameter and 20 ft. 

 high, whilst prostrate trunks 50 or 60 ft. long are not 

 uncommon. 



Evening Meeting. — November 20th, 1885. 



Mr. Noakes exhibited specimens of Tri/olium ochroleucum, 

 collected between Hertford and Bayford in July. 



The Eev. James Menzies brought a specimen of Calluna 

 vtilf/aris var. alba from Scotland. 



Mr. W. H. Tyudall read a paper on ' Mahogany — Where 

 grown — How obtained — Its quality and uses.' 



