BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 119 
Lane, Alfred C. 
1497. Annual report of the state geologist [Michigan]. — Michigan Miner, 
vol. 8, no. 4, pp. 9-13, March, 1906. 
Gives extracts from the report for 1905. 
1498. The possibility of deep cracks in the earth. — Michigan Miner, vol. 8, 
no. 0, May, 1906. 
1499. Seventh annual report of the state geologist to the Hoard of Geological 
Survey for the year 1905. — Michigan State Board of Geol. Survey. Ann. Etept. 
for 1905, pp. 535-571, 1 fig., 1906. Abstract: Michigan Miner, vol. 9, no. 1, pp. 
9-13, December. 1906; no. 2, pp. 9-13, January, 1907. 
An administrative report, but includes various notes relating to the geology of the 
State. 
1500. Die Korngrosse der Auvergnosen. E. Schweizerbartsche Verlagsbuch- 
handlung. Stuttgart. 1 ( .)<><;. 1!) pp., 1 pi., 6 figs. 
Discusses size of grain with respect to distance from sides, particularly in the Med- 
ford. Mass.. dike, and cites a practical application of the theory of the size of grains in 
cooled magmatic masses. 
1501. The influence of varying degrees of supervision in magmatic differen- 
tiation.— Canadian Min. Inst., Jour., vol. 9, pp. 210-217, L906. 
1502. Salt water in the lake mines- -Michigan Miner, vol 8, no. 7. pp. !)-12, 
June, 1906. 
Discusses the occurrence and source of waters in deep mines and their relation to the 
distribution of copper ores. 
1503. The interior of the earth. — Science, new ser.. vol. 24. pp. 404 -to."). 
September 28, 1906. 
1504. The chemical evolution of the ocean. — Abstract : Jour. Geology, vol. 
14, no. 3, pp. 221-225, 1906. 
Discusses the variation in the ratio of sodium to chlorine in the water of the ocean 
during geologic time. Includes analyses of waters from various sources, upon which 
the discussion is based. 
1505. The geologic day.— Jour. Geology, vol. L4, no. 5, pp. 12.". 429, L906. 
Discusses the problem of determining the contemporaneity in time of geologic Eorma 
tions and the criteria which may be used. 
1506. Discussion of paper by Marins R. Campbell: Hypothesis to account 
for the transformation of vegetable matter into the different grades of coal. — 
Econ. Geology, vol. 1, no. r>. pp. 498-499, L906. 
1507. Geology of Keweenaw Point [Michigan!. — Mines and Minerals, vol. _T. 
no. 5, pp. 204-200, 4 tigs., December, 1906. 
1508. Eighth annual report of the state geologist.— Michigan, State Board 
of Geol. Survey. Kept, for 1906, pp. 573-601, 1907. 
An administrative report, but includes notes on Michigan geology. 
1509. The geology of Keweenaw Point, a brief description. — Lake Superior 
Min. Inst., Proa, vol. 12, pp. 81-104, 6 tigs.. L907 . 
Describes the 1 geolpgic structure of the Keweenawan region of the Upper Peninsula 
of Michigan, the occurrence and character of the copper-bearing beds, and the source 
of the copper. 
1510. Salt water in the Lake mines. — Lake Superior Min. Inst.. Proc, vol. 
12, pp. 154-163, 1 tig., 1907. 
Describes differences in chemical composition of shallow surface derived and deep mine 
waters in the Lake Superior copper mines, and discusses the sources of the deep waters, 
and the part they may have taken in the distribution of the copper deposits. 
1511. Chemical evolution of the ocean.- Abstract : Geol. Soc. America, 
Bull., vol. 17. p. 691, 1907. 
1512. The formation of Lake Superior copper. -Science, new ser., vol. '27>. 
p. 589, April 12. 1907. 
