194 
Mr. Dancer exhibited some interesting specimens of 
American photography, lent by Thomas Higgins, Esq., of 
Liverpool. One of these pictures represented a portion 
of the valve of the Diatom Pleurasigma angulatum. 
This object has on its surface striae estimated at 52,000 in 
the inch. This was magnified 2,344 diameters by one of 
Powell and Lealand’s objectives of l-50th of an inch. 
Another of the same object was magnified 2,540 diameters 
with one of Wale’s l-8th objective with amplifier. Another 
picture exhibited these photographs enlarged to 19,050 
diameters. Notwithstanding the immense magnifying 
power employed, these photographs were remarkably sharp 
and distinct. Some of the other photographs exhibited 
magnified portions of the Podura scale. These photographs 
were taken by Brevet-Major Curtis, of the U.S.A. 
“Notes on some of the Characteristic Plants of the Channel 
Islands,” by Charles Bailey, Esq. 
Two visits to the Channel Islands, made in July, 1863, 
and August, 1867, enable me to record additional localities 
for some of the species, as well as exhibit others which have 
not hitherto been included in the flora of the Islands. 
Ranunculus peltatus, Fries, var. a, vulgaris, E. B. A 
dwarf form of this plant occurs • on L’ Ancrene Common, 
Guernsey, and in marshy ground at the eastern end of St. 
Brelade’s Bay, Jersey. 
R. Flammula, L. var. f3, pseudo-reptans, E. B. St. 
Saviour’s Yalley, Jersey. 
R. ophioglonifolius, Vill. I exhibit the foliage only, for 
though this species is very abundant in St. Peter’s Marsh, 
Jersey, the peculiar tenure on which the marsh is held 
causes it to be mown as smooth as a bowling green early in 
the year. 
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