380 TJic American Geologist. Juno, i898 
miles between the mouth of loch Treig and Tulloch. At this 
locality Louis Agassiz, in his visit to the Parallel Roads in 
1840, expressed his delight and enthusiasm in finding these 
sure records of glacial action, unsurpassed, as he affirmed, bv 
any place in the Alps. While lake Roy in its latest and most 
extended stage was forming the lowest of the Roads, the only 
one found in the Spean valley, the site of loch Treig was oc- 
cupied by ice, as is known by the absence of that Road on the 
mountain slopes inclosing the loch. 
The absence of trees or even bushes from the greater part 
of the country here described made it very easy to trace the 
moraines, as on the western prairies and plains of the nor- 
thern United States. As was said at the close of my second 
paper in this series, again it may be remarked here that prob- 
ably many such small retreatal moraines will be found in 
the valleys of the White mountains of New Hampshire, and 
of the Green and Adirondack mountains, when the general 
clearing away of the forests shall favor their discovery and 
mapping. Probably Mts. Washington and Marcy, like Ben 
Nevis, were fastnesses latest relinquished by the waning gla- 
ciation of the surrounding country at the end of the Ice age. 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Mineral Resources of the United States, i8g6. By David T. Day. 
(Eighteenth Annual Report, U. S. Geol. Survey, for 1896-97; Part V, in 
two volumes: I. Metallic Products and Coal, pp. xii, 642; II. Nonmetallic 
Products, except Coal, pp. 643-1400. Washington, 1897.) 
These separately indexed volumes, compiled with the aid of expert 
assistants, are published before the other parts of this annual report, 
that the statistics and discussion of the year's mineral industries and 
prodtTction shall be given as early as possible to those engaged in 
mining, quarrying, and all related industries and manufactures. For 
this purpose, separate brochures of many chapters, as those treating 
of iron and steel, building stone, clay-working, mineral paints, abrasive 
materials, etc., have been issued, as the printing advanced, before the 
completion of the whole, which was issued about May ist of this year, 
as early as was consistent with accurate collection and presentation of 
the extensive details of the subject in its many departments. 
