Review. of Recent, Geological Literature. 253 
questions are considered in England where so much more experience has 
been acquired than in America. u. v. w. 
Qn the Origin of certain Novaculites and Quartettes. By Frank Rut- 
ley. (Quart, .lour. Geol. Soc, vol. L, pp. 377-392, pi. li>, Aug., 1894.) 
The author shows the possibility of the derivation of sonic fine-grained 
quartzites and of the novaculites of Arkansas, so well known through 
Mr. I,. S. Griswold's "Whetstones and Novaculites of Arkansas." from 
limestones by siliceous replacement. The irregular and rhomb-shaped 
cavities in these rocks represent crystals of a rhombohedral carbonate, 
probably dolomite, and Mr. Rutley regards them as the remains of part 
of the original rock, in this case the replacement of the carbonate by 
quartz being not entirely completed. This explanation of the original 
nature of the novaculite differs from that of Mr. (iriswold, who regards 
the quartz as original. The same or similar apparent replacements of 
limestone by quartz are seen in other rocks, often of coarser grain than 
I he novaculites. Mr. Rutley thinks that it is needful to separate the rocks 
termed quartzites into two groups, including in the one indurated sand- 
stones or true quartzites ("detrital quartzites"), and in the other the 
siliceous replacements of limestones which at times simulate detrital 
quartzites; the latter can be called ••infiltration or metasomatic quartz- 
ites." r. s. G. 
Wiltyamitl — " New Mineral from Broken Hill. By E. F. PlTTMAN. 
(Records Geol. Survey, N. S. Wales, vol. iv, pt i, pp. 21-22, 1894.) This 
mineral is a sulph-anlimonide of nickel and cobalt, with the formula 
( 'oS. 2 . CoSbg : Xi So. Xi Sbj. It is isometric in crystal I i/.al ion and is very 
similar in its physical properties to the sulph-antimonide of nickel, ull- 
inaunite. Two analyses are given and each shows that nickel and co- 
balt are present in approximately equal amounts (over 13 percent.), thus 
justifying its separation from ullmannite. r. s. g. 
Papers and Notes on thi Glacial Geology of Great Britain and In la ml. 
By the late Henry Carvill Lewis; edited from his unpublished Mss. 
by Henry W. Ckosskky. Pages Ixxxi, 169, 8vo, with ten maps, and 83 
illustrations in the text. (London and New York: Longmans, Green, and 
Co., 1894.) This magnificent volume is the fulfillment by Mrs. Lewis of 
her husband's dying request, that the notes of his glacial observations 
in Ireland and Great Britain should be published, with the aid. in edi- 
torial revision, of his friend. Rev. 11. \Y. Orosskey, who also has since 
died. (For a biographical Sketch of Prof. Lewis, with a review and a 
bibliography of his scientific work, see the American Geologist, vol. 
ii, pp. 371-379, with portrait. Dec.. 1888; and for an obituary notice of 
Dr. Orosskey, vol. xtn, p. 75, Jan.. L894.) The work has been very care- 
fully edited and places on record for all students of glacial geology the 
observations and opinions of a most enthusiastic, industrious and suc- 
cessful investigator in that field, where he reaped much and well, al- 
though taken from us while yet his plans and hopes were opening with 
promise of more abundant Fruitage after years of further exploration. 
Attempting to State very concisely some of the chief points iii which 
