INDEX TO VOLUME I. 



655 



Dana, E. S 38-40 



" J. D., 38; letter from, 40; 

 calls Eozoic rocks Ar- 

 chaean, . . . 511 

 Dartmouth college, .... 20 

 " students as explorers, . 30 



3 2 , 36 



" Scientific Association, . 48 



Davis bridle-path, . . . 61,80 



Dawson, J. W 510 



Declination of needle, . . 153, 164 



DlATOMACE/E, INDEX TO : 



Page. 



Cell, typical, of Schwann, . . 445 

 Cocconeis, ..... 453 

 Cocconema, ..... 453 

 " cistula, conjugation of . 454 

 Connecting membrane of diatoma- 

 ceae, 425 



Coscinodiscus radiatus, Fig. 10. 



" structure of . . 430 



" subtilis, . . . 489 



Colletonema, ..... 453 



Concord deposit, .... 503 



Cosmarium Botrytis, . . . 505 



Chalk pond, Newbury deposit, . 503 



Cyclotella, . 433 ,453 



Cingulum of diatomaceae, . . 425 



Coscinodiscus, form of . . . 425 



Dutch rushes, diatomaceae upon . 488 

 Dust containing diatomaceae, how to 



collect, 484 



Diatoma vulgare. Fig. 20. 

 Diatom, typical form of a . 424, 425 

 Diatoma, . . . .421, 449 



" to cut through . . . 42 r 

 " hyalinum, .... 488 

 Diatomaceae, 



Natural history of, 416-419 ; mixed 

 gatherings of, to separate into den- 

 sities, 496 ; preserving and mount- 

 ing, 496 ; little known to biologists, 

 420; origin of name, 421; where 

 found, 422 ; under ice, 423 ; struc- 

 ture of, 423 ; cell-contents of, 424 ; 

 oil globules of, 425 ; feeding, 425 ; 

 valves of, 425 ; delicacy of mark- 

 ings of, 426 ; movements of, 438 ; 

 mode of movement of, not known, 

 441 ; movements of, accelerated by 

 heat, 441 ; internal anatomy of, 

 445 ; how to collect, 482 ; mode of 

 growth of, 444 ; variation of, 448 ; 

 rapid multiplication of, 44S ; re- 

 production of, 449 ; stipes or pedi- 

 cle of, 449 ; modes of occurrence 

 of, 456 ; uses to man of, 456 ; in 

 moist earth, 456; in mosses on 

 house-tops, 456 ; in dust, 456 ; in 

 mud, 458 ; in stomachs of mollus- 

 ca, 458 ; in stomachs of sea ur- 

 chins and sea cucumbers, 459 ; in 

 guano, 459 ; semi-fossil, 460 ; fos- 

 sil, fresh-water, 460 ; used as food 

 by man, 461 ; fertilizing power of, 

 462 ; on algae, 458 ; lacustrine sed- 

 imentary deposits of, 460 ; living, 

 color of, 457 ; used as food, 461 ; 

 deposits of, use as fertilizers, 462 ; 

 and geology, 463 ; in mud, 472 ; 

 directions for collecting, preserv- 

 ing, and transporting, 478 ; fossil 

 deposits of, how to collect, 478 ; 

 recent gatherings of, how to col- 



