806 INDEX. 



Page. 



Ridgway, Robert, report on department of birds by 195 



'' The Humming Birds," paper by 253 



Riker, Clarence B., notice of paper by 702 



Riley, Prof. C. V., deposits a large collection of insects 99 



honorary curator, services as 99 



notice of papers by 703 



report on the -department of insects by 219 



Rives, Dr. William C, sent two specimens of the Mountain Vireo 85 



Robinson, Wirt, notice of paper by 707 



Rockhill, W. W., Corean paintings received from 88 



ethnological objects received from 87, 128 



Rocks, Eeolian 524,543 



aqueous 524 



arenaceous group of 535 



argillaceous group of 537 



Australian collection of 591 



Brazilian collection of 591 



calcareous group of 538. 541 



Canadian Geological Survey, collection of 591 



carbonaceous group of 541 



chemical composition of 505, 520 



collection of, from Bear Paw Mountains 591 



collection of, from Commander Islands f 91 



collection of New Hampshire State Survey 590 



collections of the Fortieth Parallel Survey 590 



color of 521 



composed mainly of debris from plant and animal life 540 



composed mainly of inorganic material 535 



District of Columbia collections of 591 



effusive or volcanic 569 



eruptive 551 



ferruginous group of 540 



foliated or schistose 546 



formed as chemical precipitates 525 



formed as sedimentary deposits and fragmental in structure 534 



formed through igneous agencies 551 



from Alaska 591 



Hawes collections of 590 



igneous 524 



Leadville collection of 589 



metamorphic 524, 543 



microscopic structure of 514 



minerals of _ . 508 



Pacific slope , quicksilver collections of 590 



phosphatic group of 542 



physical and chemical properties of 512 



Pigeon Point collection of 591 



primary constituents of .' 509 



secondary constituents of 511 



siliceous group of 540 



specific gravity of 520 



structure of 512 



sulphur as a chemical precipitate of 532 



