1022 Proceedings of Royal Society of Edinburgh. [sess. 
Hippuris vulgaris,* extremely luxuriant and abundant, growing in 
water as deep as 10 feet, with the flowering stems above the 
surface. Looking over the side of the boat at the subaqueous 
meadow of foliage formed by the barren shoots of this elegant 
plant, bathed in the soft refulgence afforded by the blue sunlit 
water, was a sight not easily forgotten. Myriophyllum spicatum* 
very abundant even to 10 feet deep. This plant is so incrusted 
with lime that it is unable to rise to the surface to produce its 
flowers ; and although plentiful I saw but few flowering or fruiting 
specimens. Montia fontana, Parnassia palustris,* Hydrocotyle 
vulgaris, Veronica Anagallis,* Pedicularis palustris. Utricularia 
vulgaris down to 12 feet deep. Eupatorium cannabinum* 
about the lochs, a sure indicator of lime ; Senecio aquaticus, 
Menyanthes trifoliata, Myosotis palustris.* Samolus Valerandi * 
only seen at Loch Kilcheran ; Littorella lacustris much less 
abundant than in the Ness area ; Polygonum amphibium, Iris 
Pseud-acorus, Alisma Plantago,* Triglochin palustre, Juncus 
effusus, J. articulatus, Sparganium ramosum.* Potamogeton 
perfoliatus* growing in water 10 to 24 feet deep, and pro- 
ducing their flowers above the surface from even the greatest 
depth ; P. natans to 20 feet deep ; P. lucens, P. pusillus,* 
2 to 12 feet deep; P. filiformis* in shallow water; Heleo- 
■charis palustris. Eriophorum polystachion, small specimens ; 
Scirpus lacustris very abundant ; Carex rostrata, Cb aquatilis, 
neither of these so much in evidence as in the peaty lochs ; 
C. flacca.* Phragmites communis very abundant ; Equisetum 
limosum not abundant ; Chara aspera, var. desmacantha,* 
heavily incrusted with lime, carpets the bottom from 2 to 20 feet 
deep ; C. fragilis, var. delicatula, incrusted with lime,* carpets the 
bottom from 10 to 20 feet deep; C. hispida, var. rudis,* incrusted 
with lime at 25 to 35 feet deep; Eontinalis antipyretica abundant 
in deep water down to 40 feet deep ; Hypnum scorpioides,* a very 
robust form, from 3 to 5 feet deep, abundant ; Cladophora fracta,* 
floating in the water and about aquatic plants; Zygnema Vaucherii 
on smooth rocks. 
From the foregoing chapters it will be seen that some plants 
flourish best in water poor in food-salts and lime ; others in 
water rich in food-salts and lime ; others, as Typha, where there 
