162 Rhodora [SEPTEMBER 
tions, would delight in such a station, where there would be few or no 
all-the-year natives to compete with these summer visitors to the Maine 
coast. 
On July 13, 1908, there was here an immense quantity of individuals, 
though not very many species; most of them were blue greens; Poly- 
cystis elabens Kütz., Entophysalis granulosa Kütz., Gloeocapsa crepi- 
dinum Thuret, Oscillatoria tenuis Ag., Spirulina subsalsa Oersted, 
S. Meneghiniana Zan., Lyngbya aestuarii (Mert.) Liebm., L. semiplena 
(Ag.) J. Ag., L. subtilis Holden, Plectonema Battersii Gom., P. calo- 
thrichoides Gom., Anabaena torulosa (Carm.) Lagerh., Nodularia 
Harveyana (Thwaites) Thuret, N. spumigena Mert., Calothrix scopu- 
lorum (Web. & Mohr.) Ag., Amphithrix violacea (Kütz.) Born. & 
Flah., and some forms of Chroococcus and Plectonema that have not 
been specifically determined. ‘The green algae were Enteromorpha 
intestinalis (L.) Link, E. Hopkirkii McCalla, E. crinita (Roth.) J. 
Ag., Cladophora expansa (Mert.) Kütz., Ilea fulvescens (Ag.) J. Ag, 
and Urococcus Foslieanus Hansg. The Entophysalis was chiefly 
attached to the rocks; the Calothrix and Amphithrix to Enteromorpha 
and Cladophora; all the others were free and mingled in all propor- 
tions; sometimes in loose masses on the bottom, sometimes in rather 
denser masses at the surface; the color varying according to the pro- 
portion of the different species and to the exposure to light; the strata 
at the bottom, sheltered from the light, were mostly dark green or olive; 
those at the surface pale green, yellowish or almost white. ‘The 
quantity was astonishing; at least half the surface was covered by 
the mats, and very little of the bottom could be seen. When we 
remember than an individual of Polycystis is about 3 м diameter, 
about one ten-thousandth of an inch, while a filament of Spirulina is 
considerably less, the number of individuals in these pools, with a sur- 
face of perhaps an acre and a depth of several feet, would reach a 
figure with no real meaning to us. And there is no doubt that the 
entire quantity had developed since the beginning of the warm weather. 
The winter storms must sweep the pools clear of all such vegetation, 
except stray spores or resting cells in crevices or under ice. - 
The writer visited this station in 1903 and in 1906, each season in 
July, and the conditions were then much the same, but in 1908 the 
growth was considerably more luxuriant than before, and the level of 
the water decidedly lower, which of course meant increased salinity. 
The effect of the latter condition was seen in some abnormal appear- 
