43& THE SCIENTIFIC MONTHLY 



July, Holopedium attained an extraordinary dominance the latter part 

 of July and two species of Daphnia replaced it in late August. On 

 July 14th a net of No. 6 silk drawn for a few minutes in the lake 

 gathered a solid pailful of Holopedium in a nearly pure culture. A 

 few Leptodoras and a few Daphnias were present besides. 



We found some good collecting grounds for aquatic plants and 

 animals ; and it may benefit some future naturalist who is visiting Lake 

 George for the first time if I mention a few of them. First of all, 

 Juanita Island itself, our headquarters, has most interesting shores. 

 On the west the rocks rise vertically out of the water; on the north 

 they run down in gently sloping serried low ridges of solid rock r 

 smooth and bare as far as the breaker line; on the northeast is a broad 

 smooth sandy beach in a sheltered bay (here was our bathing beach) ; 

 on the south is a shore line of broken rocks and at the east this merges 

 into a narrow beach of ripple-marked sand. Eastward of the Island is 

 a deep current-swept channel, and northward is a more sheltered cross 

 channel in which the "grass" and "moss" of the fishermen are found. 

 There are scattering growths of Potamogeton, Ceratophyllum and 

 Heterantheria below the breaker line (which occurs here at about 5 

 feet below the surface) and just above it grow Valisneria, Eriocaluon, 

 and Lobelia. 



There is a very interesting admixture of small plants growing in 

 the rippled sand about the dock and at the edges of the beach within 

 the bay. The most abundant plant present is one of the least con- 

 spicuous, Myriophyllum tenellum, a true sand-binder of the shore, 

 whose tufted, slender interlaced stems lie buried in the sand, and 

 whose many leafless red branches rise erect but an inch or so above 

 the surface, and, draped with tufts of filamentous algae, are most in- 

 conspicuous. More in evidence is the little creeping Elatine americana, 

 that formed close-growing patches the size of a silver dollar on the 

 surface of the sand, and that is fairly covered in August with minute 

 blossoms. Intermixed with it, and likewise persistently blossoming 

 is the curious little cruciferous quillwort, Subularia aquatilis, which 

 grows erect to a height of perhaps an inch above the surface of the sand. 

 Another pygmy component of this inch-high vegetation is the slender 

 creeping spearwort, Ranunculus flammula filiformis which here spreads 

 by stolons about an inch long in single lines of progression over the 

 sand. Another is an undetermined closely tufted spike-rush, whose 

 roots bear numerous slender little brownish tubers. 



There are also scattering plants of taller stature here; bushy little 

 sprays of Neds flexilis, pinnate sprays of Potamogeton perfoliatus and 

 P. heterophyllus, the latter having when grown two or three oblong 

 leaves that reach the surface. There are small tufts of eelgrass, . 

 Valisneria spiralis, in the more exposed places on tufts of two species 



