252 Notes and Comments. 
of the same intrusion, although the minerals of apophyses are 
not always the same as those of the main mass. No evidence is 
afforded for a genetic connexion between the different intrusions. 
RARE MINERALS. 
One of the most remarkable results obtained is the rarity of 
magnetite and the wide prevalance of pyrrhotite, which was 
present in every sample examined, some thirty in number. 
Special attention was paid to the characteristics of the zircon- 
crystals, which lent no support to the conclusions of Chrust- 
choff as to the occurrence of definite types in granite and gneiss- + 
ose rocks respectively. In parts of both the Skiddaw granite 
and the Threlkeld micro-granite, anatase and brookite were 
found in abundance. It was not possible to determine their 
origin. Epidote is the characteristic mineral of the Ennerdale 
granophyre, while garnet is abundant at Threlkeld and Esk- 
dale. The Eskdale granite also contains much tourmaline. 
The Shap granite is especially characterized by apatite and 
sphene. 
DETECTION OF ACCESSORY MINERALS. 
The method adopted by Messrs. Rastall and Wilcockson is 
the only way to detect the rarer accessory minerals of rocks. 
One of the samples which they crush down contains about 5 
or 6 cubic inches, and may yield perhaps 5 or 6 minute crystals 
of a rare mineral like anatase. A thin slice has at most a 
volume of ;,/55 cubic inch, and the chance of its catching one 
of the crystals is therefore something like one in Iooo. Of 
specific results, the wide distribution of pyrrhotite in these 
Lake District intrusions is interesting. 
03 
The Memoirs and Proceedings of the Manchester Literary and Philo- 
sophical Society, 1913-14, includes papers on ‘ Faunal Survey of Ros- 
therne: Preliminary List of Lepidoptera found round the Mere,’ by 
A. W. Boyd, and ‘ Juvenile Flowering in Eucalyptus globulus,’ by Prof. 
F, E. Weiss. 
The Annual Repcrt of the North Staffordshire Field Club, Volume 
XLIX., recently issued, contains the usual reports of the various sections 
on natural history, together with notes on archeology and other matters. 
Among the items likely to interest our readers are: the Presidential 
Address, ‘ Staffordshire Mammals,’ by J. R. B. Masefield; ‘ Mining Note 
Book of 18th Century,’ by J. T. Stobbs ; ‘ Bird Notes (1914),’ by W. Wells 
Bladen; ‘Holocene Mollusca of Letocetum,’ by H. Overton. The 
volume is edited by S. A. H. Burne. 
The Transactions of the Perthshire Society of Natural Science, volume 
6, part 1, has pages 32-54, and contains the following :—‘ The Drought of 
1913,’ by C. M’Intosh; ‘ List of Plants in Flower in November, 1913,’ by 
W. Barclay; ‘ Potamogeton trichodes, Cham. et Schlect, as a probable 
Perthshire Species,’ by A. Bennett; ‘The Evolution of Man in the Great 
Ice Age,’ by Dr. Lyell; ‘New Perthshire Fungi,’ by James Menzies.; 
‘‘ Further notes on Highland Rocks,’ by George F. Bates. There is also 
an elaborate record of the Society’s meetings and excursions. The report 
is illustrated by several plates. 
Naturalist, 
