538 



PROCEEDINGS OF THE PHILADELPHIA MEETING 



Editor's Report 



To the Council of the Geological Society of America : 



The Editor is particularly glad to be able to state that through the 

 cooperation of the members it has been possible to complete volume 15 

 before the winter meeting of the Society. This desirable result can 

 always be accomplished if contributors will be prompt in forwarding 

 their papers and in returning proof. 



Though volume 15 is unusually large and surpasses its predecessor in 

 size, it is less voluminously illustrated. It contains 636 pages of text 

 and has 59 half-tone plates and 16 line drawings. There has been a 

 noticeable tendency to increase the size and the illustrative material of 

 later volumes. The average number of pages of the first ten volumes 

 was 544 and of plates 26, while volumes 11 to 15, inclusive, have an 

 average of 603 pages and 57 plates. There has been in consequence an 

 increase in cost of publication, but the average per page has been very 

 slight. The cost of volume 15 is given below and a tabulated comparison 

 made with the average cost of the first ten volumes and the individual 

 cost of volumes 11, 12, 13, and 14. 





Average. 

 Vols. 1-10. 



Vol. 11. 



Vol. 12. 



Vol. 13. 



Vol. 14. 



Vol. 15. 





pp. 544. 

 pis. 26. 



pp. 651. 

 pis. 58. 



pp. 538. 

 pis. 45. 



pp. 583. 

 pis. 58. 



pp. 609. 

 pis. 65. 



pp. 636. 

 pis 59. 



Letter-press 



$1,465 14 

 200 40 



$1,815 56 

 373 68 



$1,445 73 

 414 80 



$1,647 12 

 477 27 



$1,657 50 

 431 21 



$1,661 21 

 457 76 









$1,665 54 . 



$2,189 24 



$1,860 53 



$2,124 39 



$2,088 71 



$2,118 97 





$3 23 



$3 36 



$3 45 



$3 64 



$3 43 



$3 33 







The following is a reasonably correct analysis of the contents of vol- 

 umes 7 to 15, inclusive : 



,...„, Vol. 7, Vol. 8, Vol. 9, Vol. 10, Vol. 11, Vol. 12, Vol. 13, Vol. U, Vol. 15, 



jjivibionb. Pages. Pages. Pages. Pages. Pages. Pages. Pages. Pages. Pages. 



Areal geology 38 34 2 35 65 199 125 48 115 



Dynamic geology . 3 24 85 24 110 23 17 47 9 



Economic geology 4 14 16 28 7 5 4 1 3 



Glacial geology 5 98 138 96 21 55 1 48 48 



Historical 16 46 . . 24 1 52 



Memoirs 28 8 12 27 60 2 32 14 18 



Official matter 56 69 54 72 59 58 153 68 63 



Paleontology .....123 58 64 68 188 5 42 22 1 



Petrology 40 43 44 59 54 24 28 183 7 



Pysiographic geology.... 53 5 . . 37 10 53 24 59 54 



Geology and pedagogy. . . 12 



Rock decomposition 74 26 17 9 .. 16 



Stratigraphic geology. ... 21 67 28 62 31 98 116 118 266 



Terminology 1 .. .. 1 .. .. 5 



Total 558 446 460 534 651 538 583 609 636 



