282 TRANSACTIONS OF THE [Sess. iaxviii. 



magnesium sulphate, and 2*655 grains of potassium and 

 sodium chloride. Pure cultures of Bacillus vulgaris, Haus., 

 were also obtained from the sample. 



The shores of the pool are treeless, except for scattered 

 specimens of Willow and Alder, while the margin is some- 

 what gravelly. On the western shore, the bog plants are 

 invading the pool, but the typical reed-swamp, met with 

 in many similar lochs, is absent. 



Pilularia is confined to the still, shallow water of the 

 sheltered western shore, and its more immediate associates 

 among the aquatics are Myriopliyllum spicatum, Linn., 

 and Potamogeton natans, Linn., both of which are 

 abundant in the deeper water. On the eastern margin, 

 where the stream enters the pool, Glyceria fluitans, Br., 

 is associated with Eleocharis multicaiilis, Sm., while 

 Littorella tinifiora, Asch., accompanied by Apium inun- 

 datum, Reich, fil., occurs in great profusion. Towards the 

 lower end of the pool, Nitella opaca, Ag., is frequently met 

 with close to the shore. Potamogeton densus, Linn., and 

 Ranunculus peltatus, Sch., are also present, while scattered 

 tufts of Juncus effusus, Linn., are of common occurrence. 

 Among the Algae noted were species of Oeclogonium, 

 Bulbochaete and Mougeotia. Mougeotia was found in 

 quantity, entangled with Myriophyllum, and it is a point 

 of interest that, although Warming (1909) refers to the 

 Mesocarpeae as being calciphilous, this alga should thrive 

 in water containing such a small percentage of lime. 



Epiphytic Diatoms are common on the submerged plants, 

 but Desmids are comparatively rare. 



On the muddy shores of the pool, the plants met with 

 are those characteristic of such a situation, and include the 

 following species : Viola 'jiulustris, Linn. ; Viola lutea, 

 Sm. ; Anagallis tenella, Murr. ; Scutellaria minor, Huds. ; 

 Chrex fiava, Linn. ; Equisetum arvense, Linn. ; Aulacom- 

 nium pcdustre, Schwaeg. ; Hypnum cuspidatum, Linn.; 

 Hylocomium squarrosum, B. et S. 



On the eastern margin, terraces of Sphagnum subsecun- 

 dum, Nees, with its usual associates, fringe the strand, 

 but, behind the Pilularia zone, the ground is more boggy, 

 and the Cottongrass is a dominant plant. Sphagnum is 

 accompanied by : Drosera rotundifolia, Linn. ; Drosera 



