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TO THE AUTHOR OF THE BEST DISCOVERY, OR MOST USEFUL INVENTION, RELATING TO NAVIGATION, ASTRONOMY, OR
PHILOSOPHY (MERI NATURAL HISTORY ONLY EXCEPTED) UNDER THE FOLLOWING CONDITIONS : 1. The candidate shall, on or before November 1, 1912, deliver free of postage or other charges, his discovery, invention or improvement, addressed to the President of the American Philosophical Society, No. 104 South Fifth Street, Philadelphia, U. S. A., and shall distinguish his performance by some motto, device, or other signature. With his discovery, invention, or improvement, he shall also send a sealed letter containing the same motto, device, or other signature, and subscribed with the real name and place of residence of the author.
2. Persons of any nation, sector denomination whatever, shall be admitted as candidates for this premium.
3. No discovery, invention or improvement shall be entitled to this premium which hath been already published, or for which the author hath been publicly rewarded elsewhere.
4. The candidate shall communicate his discovery, invention or improvement, either in the English, French, German, or Latin language.
5. A full account of the crowned subject shall be published by the Society, as soon as may be after the adjudication, either in a separate publication, or in the next succeeding volume of their Transactions, or in both.
6. The premium shall consist of an oval plate of solid standard gold of the value of ten guineas, suitably inscribed, with the seal of the Society annexed to the medal by a ribbon. All correspondence in relation hereto should be addressed TO THE SECRETARIES OF THE AMERICAN PHILOSOPHICAL SOCIETY No. 104 South Fifth STREET
PHILADELPHIA, U. S. A.
General Meeting—April 17-19, 1913
The General Meeting of 1913 will be held on April 17th, 18th and 19th, beginning at 2 p. m. on Thursday, April 17th.
Members desiring to present papers are requested to send to the Secretaries, at as early a date as practicable, and not later than April 7, 1913, the titles of these papers, so that they may be announced in the final programme which will be issued immediately thereafter, and which will give in detail the arrangements for the meeting.
Papers in any department of science come within the scope of the Society, which, as its name indicates, embraces the whole field of useful knowledge.
The Publication Committee, under the rules of the Society, will arrange for the immediate publication of the papers pre. sented.
1. MINIS HAYS
ARTHUR W. GOODSPEED
AMOS P. BROWN
HARRY F. KELLER
Members who have not as yet sent their photographs to the Society will confer a favor by so doing; cabinet size preferred.
It is requested that all correspondence be addressed
TO THE SECRETARIES OF THE
AMERICAN PHILOSOPHICAL SOCIETY
104 South FIFTH STREET
PHILADELPHIA, U S. A,
Coal beds, Devonian, Carboniferous, Mesozoic and Tertiary, alike, are associated with shales, sandstones and, in many cases, with calcareous beds, the last often containing a marine or a fresh-water fauna. Interior or limnic basins frequently bear close resemblance to paralic or coastal basins, so that distinction between the types becomes arbitrary in some great areas.
In the Indiana-Illinois field, wide invasions of the sea appeared again and again throughout practically the whole period of accumulation. On the other hand, the Appalachian basin, almost land-locked during most of its history, experienced few invasions and those, of comparatively small extent, were confined to the earlier periods; in the later stages, the whole region was practically limnic.
Study of reports by observers in the several countries makes certain that conditions needed for formation of coal beds were to
Part I. appeared in these Proceedings, Vol. L., pp. 1-116; Part II. in same volume, pp. 519-643. PROC. AMER. PHIL. SOC., LI. 207 A, PRINTED DEC. 13, 1912.