Proceedings. 



11 



springs, streams, and ponds on the chalk it would probably 

 pass almost without notice, as its special characteristics 

 would be found reproduced elsewhere. The stream that 

 supplies it is a very slender one, but suffices to keep up a 

 slight current through the pool. The water is perhaps eight 

 feet deep, and is perfectly clear ; and the white chalk bottom 

 gives to it a beautiful bluish tinge. There are a considerable 

 number of good-sized Trout in the pond, evidently accustomed 

 to be fed by visitors ; they would come with a sudden dash at 

 a bit of bread thrown in to them, and seize it and be off 

 instantly. A Yellow Wagtail was observed by the Pool, a 

 species of bird not so common in our neighbourhood as in 

 others where water is more prevalent. While the party were 

 partaking of lunch in the summer-house erected on the edge 

 of the Silent Pool, our conductor. Dr. Bossey, exhibited 

 under a small microscope specimens of Diatoms which he 

 had obtained from the Pool a few days previously, including 

 the following species : — 



Amphipleura pellucida. 

 Amphora ovalis. 

 A. minutissima. 

 Campylodiscus costatus. 

 Cocconera lanceolatum. 

 C. cistula. 



Cocconeis Pediculus. 

 Cymbella capitata. 

 Cymatopleura elliptica. 

 C. Solea. 

 Diatoma vulgare. 

 Gomphonera acuminatum. 

 G. constrictum. 

 Himantidium pectinale. 

 Melosira varians. 

 Navicula affinis. 

 N. amphirhyncus. 

 N. cuspidata. 

 N. firma. 

 N. gibberula. 



[All the above were taken from the 

 exhibited on the spot by 



Navicula ovalis. 

 Nitzschia Sigmoidea. 

 Odontidium mutabile. 

 Orthosira arenaria. 

 Pinnularia acuta. 

 P. major. 

 P. oblonga. 

 P. radiosa. 

 P. stauroneiforrais. 

 P. viridis. 

 P. viridula. 



Pleurosigma attenuatum. 

 Stauroneis gracilis. 

 S. linearis. 

 Surirella biseriata. 

 Synedra radians. 

 S. capitata. 

 Tabellaria flocculosa. 

 Triblionella angustata. 



Pool, named, mounted, 

 Dr. Bossey. J 



and 



