Reviezv of Recent Geological Literature. i8i 
Hills mark the level of the Cretaceous peneplain, dominant farther 
inland. Below this is a "coastal peneplain," which rises westward 
and bevels off the earlier and higher level. Below this, again, is the 
basin. The discussion of the surface geology presents nothing new, 
in the chief author's part. This is followed by a paper entitled "Lake 
Bouve, an extinct glacial lake in the southern part of the Boston 
Basin," by Dr. A. W. Grabau. An entirely separate chapter closes 
the work, on the "Palaeontology of the Cambrian terranes of the 
Boston Basin," also by Dr. Grabau. Both papers are full, containing 
new material as well as a summary of existing knowledge; and they 
should be reviewed separately. 
Altogether, this thicd part of the Boston Basin papers is a not- 
able contribution on a difficult field; and shows most pains-taking 
labor. It is much to be regretted that the society has not completed its 
publication by issuing the geological map of the area which, the 
text states, accompanies the report. Also, the great care shown in 
gathering the field details does not appear to have been extended 
to all parts of the make-up of the paper. There is neither table of 
contents nor index, nor list of illustrations ; nor is there any ref- 
erence in the title to the two important contributions of Dr. Grabau. 
More summaries scattered through the work would prove a help, and 
the igneous part suffers much from almost an absence of chemical 
analysis. In places, too, theory is presented before evidence, and the 
two are not always dissociated clearly. The illustrations are excel- 
lent, the photographs being reproduced by gelatine process, and the 
original drawings of fossils successfully treated in the same way. 
J. E. w. 
Notes OH the Tellnrides from Colorado. By Charles P.\lache. (Am. 
J. Set., i6o, 419-427.) 
The article gives the results of a careful and admirable crystal- 
lographic study of the mineral sylvanite together with a chemical inves- 
tigation of the same. The analyses show the composition to be repre- 
sented by the formula Au Ag Te^, thus confirming the conclusions pre- 
viously reached by Pearce from analyses made by him on massive 
material from Cripple Creek. The goldschmidtite of Hobbs is shown 
by Dr. Palache to be identical in crystallization with sylvanite. Owing 
to this identity it is thought that the analyses made by Hobbs may 
have been rendered inaccurate by the extremely small quantity with 
which he worked, and in a note incorporated in the article. Prof. 
Hobbs withdraws the name goldschmidtite as representing a distinct 
species. The article is concluded by a note on the crystal habit of 
hessite from Boulder, Colorado. c. h. w. 
Mohawkite, Stibio-Domeykite, Domeykite, Algonodite and some arti- 
ficial copper arsenides. By George A. Koenig. (Am. J. Sci., 160, 
439-448.) 
The copper arsenides occurring in the Keweenaw copper formation 
of Michigan are found only in veins intersecting the bedded deposits 
of native copper, and have so far, been observed only near the foot of 
