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Plato 1.-Huronian quartzite of East Neebish Rapids, Saint Mary's River...

II.-Crystal-faced enlargements of quartz fragments.
III.-Thin sections of quartzites ...
IV.-Thin sections of red quartzito ..

V.-Thin sections of sandstone and quartzite.

VI.—Thin sections of quartzite, &c.....
Fig. 1.-Portion of section of Eagle Harbor sandstone.
Fig. 2.-Enlarged fragment of triclinic feldspar
Fig. 3.-Enlarged fragment of feldspar, including some quartz
Fig. 4.-An enlarged fragment of orthoclase...

Page

187 197 199 207 209 213 229 229 230 231

BULLETIN NO. 10.

Plate I.- Fossils of the Saint Jobn formation

II.-Fossils of the Saint John formation.
III.- Fossils of the Saint John formation
IV.-Fossils of the Saint John formation
V.-Fossils of the Saint John formation
VI.- Fossils of the Saint John formation
VII.-Fossils of the Braintree argillites
VIII.- Fossils of tbe Braintree argillites
IX.- Fossils of the Braintree argillites
X.-New Phylloid crustacean

336 338 340 342 344 346 348 330 352 354

BULLETIN NO. 11.

Plate 1.- Sketch map of the Great Basin

II.—Comparative dimensions of Pompholyx effuva
III.-Comparative dimensions of shells...
IV.-Comparative dimensions of shells from fresh and brackish stations.

V.-Comparative dimensions of shells....

VI.–New recent and Quaternary mollusca.
Fig. 1.—Diagram showing superposition of tufas.
Fig. 2.-Dentition of Amnicola dalli ...
Fig. 3.- Articulation of intermediate teeth....

357 412 414 416 418 420 365 400 400

BULLETIN NO 12.

Plate I.-A characteristic specimen of thinolite

II.--Illustrations of the structure of thinolite

III.-Illustrations of the structure of thinolite....
Fig. 1.—Diagrammatic section, illustrating the relation of the tafas

423 452 454 431

BULLETIN NO. 14.

Page Fig. 1.-Electrical conductivity and temperature-coefficient of silver-platinum alloys

608 Fig. 2.—Diagram of tho relation between specific electrical resistance and tem

peraturo-coefficient for wrought iron, for steel, and for cast iron... 615 Fig. 3.—Diagram of a resistance apparatus for measuring heat conductivity.. 618 Fig. 4.- Apparatus for hardening steel rods

621 Fig. 5.-Form of thermo-element

624 Fig. 6.-Disposition of thermo-electric apparatus...

625 Fig. 7.—Disposition of appartus for measuring the galvanometer-factor.. 625 Fig. 8.-Details of thermo-electric apparatus.....

626 Fig. 9.-Hard wires annealed for six consecntive hours in steam, at 1000. 638 Fig. 10.—Hard wires annealed continuously at 09, 66°, 1000, 1850, 3300, and 1,0000, respectively....

647 Fig. 11.—Diagram of the relation between the thermo-electric power of steel in different states of temper, and its specific resistance

656 Fig. 12.-Disposition of apparatus for calibration ...

665 Fig. 13.-Specific resistance and thermoelectric constant; ster!, silver-gold, silver-platinum, silver-zino....

678 Fig. 14.-Disposition of apparatus ...

698 Fig. 15.--Specific magnetism of rods annealed from 0° to 1,0000

709 Fig. 16.-Disposition of apparatus for resistance measurement

713 Figs. 17, 18.-Relation between specific magnetism and hardness of steel for different dimension-ratios ...

733 Figs. 19, 20.-Relation between specific magnetism and dimension-ratio of steel rods, for different degrees of hardness

735 Fig. 21.-Diminution of specific magnetism and specific resistance produced by continued annealing (low temperatures).

748 Fig. 22.-Simultaneous variation of specific magnetism and specific resistance in case of continued annealing (low temperatures)...

754 Fig. 23.-Simultaneous variation of specific magnetism and specific resistance in case of continued annealing (high temperatures)..

756 Fig. 24.-Diagram of the inean variation of the thermo-electric harness and of

the specific electric resistance of iron carburets, with their degrees
of carburation ....

777
Fig. 35.-Classification diagram
Fig. 26.-Apparatus for hardening.
Fig. 27.-Disposition of apparatus...
Fig. 28.-Original form of thermo element
Fig. 29.--Thermo-currents evolved in a hard and thick cylinder
Fig. 30.-Relation between thermo-electric power and specific resistanco.
Fig. 31.--Diagram of Ruths' results....

ADVERTISEMENT.

(Bulletin 7.)

The publications of the United States Geological Survey are issued in accordance with the statute approved March 3, 1879, which declares that

“The publications of the Geological Survey shall consist of the annual report of operations, geological and economic maps illustrating the resources and classifications of the lands, and reports upon general and economic geology and paleontology. The annual report of operations of the Geological Survey shall accompany the annual report of the Secretary of the Interior. All special memoirs and reports of said Survey shall be issued in uniform quarto series if deemed necessary by the Director, but otherwise in ordinary octavos. Three thousand copies of each shall be published for scientific exchanges and for sale at the price of publicatiou ; and all literary and cartographic materials received in exchange shall be the property of the United States and form a part of the library of the organ. ization. And the money resulting froin the sale of such publications shall be covered into the Treas. ary of the United States."

On July 7, 1882, the following joint resolution, referring to all Government publications, was passed by Congress :

** That whenever any document or report shall be ordered printed by Congress, there shall be printed, in addition to the number in each case stated, the "usual number” (1,900) of copies for binding and distribution among those entitled to receive them."

Under these general laws it will be seen that none of the Survey publications are furnished to it for gratuitous distribution. The 3,000 copies of the Annual Report are distributed through the documentrooms of Congress. The 1,900 copies of each of the publications are distributed to the officers of the legislative and executive departments, and to stated depositories throughout the United States.

Except, therefore, in those cases where an extra number of any publication is supplied to this office by special resolution of Congress, as bas been done in the case of the second, third, fourth and fifth Annual Reports, or where a number bas been ordered for its use by the Secretary of the Interior, as in the case of Williams's Mineral Resources; the Survey has no copies of any of its publications for gratuitous distribution.

ANNUAL REPORTS.

Of the Annnal Reports there have been already published:

I. First Annual Report to the Hon. Carl Schurz, by Clarence King. 1880. 89, 79 pp. 1 map. A preliminary report describing plan of organization and publications.

II. Report of the Director of the United States Geological Survey for 1880-'81, by J. W. Powell. 1882. 89. lv, 588 pp. 61 pl., 1 map.

III. Third Annual Report of the United States Geological Survey, 1881-'82, by J. W. Powell. 1883. 80. xviii, 564 pp. 67 pl. and maps.

IV. Fourth Annual Report of the United States Geological Survey, 1882-'83, by J. W. Powell. 1884. 80. xii, 473 pp. 85 pl. and maps.

The Fifth Annual Report is in pross.

MONOGRAPHS

So far as already determined upon, the list of the Monographs is as follows:
I. The Precious Metala, by Clarence King. In preparation.
II. Tertiary History of the Grand Cañon District, with atlas, by Capt. C. E. Dutton. Published.

III. Geology of the Comstock Lode and Washoe District, with atlas, by George F. Becker. Pablished.

IV. Comstock Mining and Miners, by Eliot Lord. Published.
V. Copper-bearing Rocks of Lake Superior, by Prof. R. D. Irving. Published.
VI. Older Mesozoic Flora of Virginia, by Prof. William M. Fontaine. Published.
VII, Silver-lead Deposits of Eureka, Nevada, by Joseph S. Curtis. Published.
VIII. Paleontology of the Eureka District, Nevada, by Charles D. Walcott. In pross.

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