Notices of Memoirs—Luminosity of Uranium. 81 
in the quarry at Shap summit, near the Granite works, which is said 
to be the same Limestone, though there are frequent vegetable Tempins 
(Stegmaria, etc.) in that quarry. 
Professor Garwood, in his provisional correlation of the Faunal 
Succession in the Carboniferous Limestone of these Northern exposures,* 
places the Meathop Fell Beds doubtfully im C,, and correlates them 
with similar dolomitic beds at Crag Mollet in the Brigsteer section. 
At the latter place a bed occurs at the base which is marked by clusters 
of Diphyphylium pseudo-vermiculare (M‘Coy). This same. form also 
occurs abundantly near the top of the Shap—Ravenstonedale Lime- 
stone, so that the beds containing A. Vanuxemi at Shap are, in all 
probability, equivalent to the ‘ Vanuxemi Beds’ at Meathop Fell. 
Professor Garwood further remarks on the possibility of the above 
Diphyphyllid Lithostrotion being considered typical of (S), in which 
case the Meathop Fell Beds, and others, would have to be included in 
S) also. 
=. discovery, therefore, of 4. Vanuxemi at Meathop Fell, coupled 
with its occurrence in beds of, presumably, the same age at Shap, may 
be helpful in arriving at a satisfactory conclusion as to the correct 
horizon of these beds, especially when the exact horizon of. the plant 
is known in the North Wales exposure. 
In conclusion, [ must express my indebtedness to Mr. J.T. Stobbs, 
F.G.8., and Dr. T. F. Sibly, F.G.S., ete., for their kindness in 
confirming the identification of several specimens, and to Dr. R. 
Kidston, F.R.S., etc., for kindly looking over the plant remains and 
giving me his opinion thereon. 
NOTICES OF MEMOTRS.- 
Nore on THE Spontaneous Luminosity oF A Uranium Muryerat.? 
By the Hon. R. J. Srrurr, M.A., F.R.S., Professor of Physics, 
Imperial College of Science, Stange, Kensington. 
UMOURS of luminosity having been observed in Cornish seeShnverea |, 
in the dark, are not infrequent. I have myself been told of 
such phenomena by rustics in the mining district, and more than one 
hoe has mentioned something similar. 
. F. W. Rudler® has quoted a remark by the late Mr. Garby 
ae specimens of uranite ‘‘ when first discovered by the miners in 
Huel Buller and Huel Basset were very phosphorescent, so much so 
that after the lights were extinguished many of the crystals might be 
discovered in situ’’,* and he has suggested that this may be in some 
way connected with the self-luminosity of radio-active bodies. The 
observation would seem to have been made by the miners, not by 
a scientific observer, and it is implied that the luminosity was of the 
nature of ordinary phosphorescence, and due to previous exposure 
to light. 
Gzou. Mac., 1907, p. 70. 
Proc. Roy. Soc., Series A, 1909, vol. Ixxxiii, p.. 70. (Abridged. 
Handbook to Minerals of the British Islands, ‘pub! ished by the Geological Survey. 
Trans. Roy. Geol. Soc. Cornwall, 1865, vol. vii, p. 86. 
DECADE V.—VOL. VII.—NO. It. 6 
eo WH 
