556 



INDEX. 



Pelagic fish eggs, embryo, the relation 

 of the median ])lanc of the, to 

 tlic lirst plane of the clcavaije, 

 71. 



eutoJerm, the origin of the, 6G. 



explanation of figures, 75. 



germ layers, the, 03. 



KajjUer's vesicle, 71. 



nietliods, 28. 



nenrcnteric canal, 73. 



nuclei, 02. 



ovum, general remarks on, 30. 



periblast, the, 03. 



pcriblastic cells, origin of, 54. 



pronuclei, 41. 



secondary caudal vesicles, 73. 

 Pentstcmon Havardi, 306. 



nndiflorus, 306. 

 Peridermium, 322. 



abietiuum, 320, 322. 



balsamcum, Peck, 322. 

 Peucedanum llowcUii, 369. 



Suksdorfii, 369. 

 Pbacclia Arizonica, Gray, 303. 



invenusta, 303. 



Ixodes, Kellogg, 303. 



Lyoni, 303. 



Popei, Torr. & Gray, 303. 



Rattani, 302. 



saxicola, 304. 

 Phasniida, 167. 

 Phaulothamnus, 293. 



spiuesecns, 294. 

 Photographic dry plates, a method of 

 measuring tlic absolute sensi- 

 tiveness of, 159. 



senshiveness of, table, 162. 

 Photographic cxposers, methods of 

 determining the speed of, 478. 

 Photographic cxposers, priiiei])lcs in- 

 volved iu the coubtrucliou of, 

 483. 

 Picea Breweriana, 378. 

 Plagiobothrys, Pisch. & Meyer, 261, 

 2S1. 



Arizoiiieus, Greene, 284. 



canescens, Bcntb., 284. 



Cooperi, 285. 



gloincratus, 286. 



hispidus, 286. 



Kingii, 281. 



nothofulvus, 285. 



proeunibens, 283. 



rufescens, Fiseh. & ]\reycr, 282. 



Shastensis, Greene, 284. 



teuellus, 283. 



Plagiobothrvs tinctorius, 283. 



Torreyi, 284. 



ursinus, 286. 

 Plants, chiefly from our Western ter- 

 ritories, descriptions of some 

 new species of, 352. 

 Polioehera, 16. 



punctulata, 16. 

 Polioehcrida;, 16. 

 Polioptenns, 168, 170. 

 PringlcophytuMi, 292. 



lanceolatum, 293. 

 Protolyeosa, Koenier, 22. 



anthracopliila, Kocnier, 14, 22. 

 Protophasnia, liroiigniart, 170. 



IJumasi, Brong., 170. 



E. 



Ilhus integrifolia, 358. 



ovata, 358. 

 Roestelia, 311, 316, 317, 318, 319, 

 320. 



aurantiaca, 318, 319. 



botryapites, 318, 319. 



lacerata, 318, 319. 



penicillata, 318, 319. 



transformans, 315, 319. 

 Rosa acienlaris, 330, 334, 337, 339, 

 3J0. 



Aleutcnsis, 334, 342. 



alpina, 330. 



Arkansana, 333, 337, 341. 



arvensis, 330. 



blanda, 326, 327, 330, 337, 339, 

 341. 



Bourgeauiana, 334. 



bract eata, 352. 



Californiea, 331, 334, 337, 343. 



canina, 325, 328, 351. 



Carelica, 339. 



Carolina, 325, 326, 328, 338, 

 346. 



Carolinensis, 326. 



Caroliniana, 327. 



Cherokeensis, 329, 352. 



cinnaniomca, 329, 332. 



eoryndx)sa, 326, 346. 



Durandii, 334, 342. 



enneaphylla, 328. 



Evratina, 328. 



Fcndlcri, 334, 337, 344. 



fenestrata, 329, 350. 



flcxuosa. 328, 330, 351. 



llorida, 329. 



