GEOLOGICAL MAGAZINE 
VOLUME LVIII. 
No. VIII.— AUGUST, 1921. 
EDITORIAL NOTES. 
ee appearance of a new part (No. 20) of Geological LInterature 
added to the-Geological Society's Library in 1913 will be welcomed 
by all who are actively engaged in geological work. In the interests of 
research it is to be hoped that the issue of the records for 1914 and 
subsequent years will not be long delayed, as this publication is of the 
greatest possible value, in fact one might almost say indispensable 
to all who desire to keep up with the current developments of their 
particular branch of the subject. Our thanks are due to the 
anonymous compiler of this part; only those who have had 
experience in bibliographical work can form any idea of the amount 
of time and trouble which its preparation must have involved. 
kK * * ES * 
Durine the year 1921-22 Geophysical Discussions of the Royal 
Astronomical Society will take place on the first Friday in November, 
December, February, March, and May. In each case the meeting 
will begin at 5 p.m., and tea will be provided at 4.30. On 
4th November Col. H.G. Lyons will open a discussion on the Eétvés 
Gravity Balance. On 2nd December Dr. Harold Jeffreys will open a 
discussion on the Cooling of the Earth and. its Geological Effects. 
Fuller particulars of the meetings will appear in Nature, or can 
be obtained on application to the Assistant Secretary, Royal 
Astronomical Society, Burlington House, London, W.1. All 
-members of the Geological Society are invited. 
* ok * * * 
Iy comparison with the amount of attention bestowed on the 
nomenclature of the igneous rocks, that of the sediments has been 
comparatively neglected. All field-workers in stratigraphical 
geology must have been often conscious of a want of precision in the 
terms at their disposal for the description of the rock-types 
encountered in the course of their work. This applies perhaps with 
the greatest force to the arenaceous types of sediment. The special 
point that we have in mind is the want of a satisfactory field-term 
to describe the very hard fine-grained rocks that are so abundant 
for example in the Silurian system in most parts of this country. 
These are generally called grits, but this is a misapplication of the 
VOL. LVIII.—NO., VIII. 22 
