1882-1883.] '59 



pool at its base. This is the spot known as the " rumbling 

 holes," which are tokens that the stream has always been 

 engaged cutting its way backward through the rocks. Stones 

 are from time to time carried over a fall, these are whirled 

 round in the eddy at the bottom, and often hollow out the 

 rocks, leaving as the fall recedes those beautifully circular holes 

 so often seen in such places ; sometimes remaining after the 

 fall itself has vanished, as is the case of one just above this spot. 

 A short meeting was held here, and two new members elected. 

 The party then divided, some in search of plants and insects, 

 others to geologise, and a few to enjoy the general and parti- 

 cular beauties of scenery of this romantic spot. The flora of 

 Collin Glen includes several plants of considerable rarity, and is 

 therefore of much interest to the botanist. A few plants of the 

 pretty little winter green {Pyrola minor) still hold their ground, 

 in a secluded and almost inaccessible position near the head of 

 the glen. Two or three stems only were taken on this occasion. 

 The very rare horsetail {Equisetum trachyodon) is still to be 

 found on wet rocks by the stream, and the great drooping sedge 

 {Carex pendula) occnr^ in sever?X places, along with the still 

 rarer Carex strigosa. A special prize was oifered by the Club 

 for the best series of ferns and grasses. The prize was awarded 

 to Mr. Edward Smith, who collected the largest number of 

 species. A prize was also offered for the best collection of 

 fossils. The Cretaceous and the Liassic rocks, as is well known, 

 are seldom better displayed than in this glen, which is rendered 

 of greater interest by being the site of one of the ancient land- 

 slips which so often occur where porous water-bearing rocks 

 overlie the Lias shales. A great mass of the former have slid 

 forward, and, as the stream in its downward course has cut 

 through both the parent rock and the detached landslip, a 

 double succession of the geological series is met with, constitut- 

 ing, at first sight, somewhat of a puzzle to the student who 

 here commences his investigation of these rocks. The prize 

 was awarded to Mr. Charles Bulla, who succeeded in collecting 

 seventeen species, comprising double that number of individuals 



