XVI LIST OV ILLUSTRATIONS. 



Page. 



89. Modern liarpoon head of iron, Cund^erlaud Sound 301 



90. Iron toggle head, Amur River, Asia 301 



91. Shaft of toggle harpoon, Cumberland Sound 302 



92. Bone foreshaft of harpoon, Bristol Bay, Alaska 302 



Contributions to the History of Musical Scales. 

 By Charles Kasson Weaj). 



1. European mandolin, after ^'iollet le Due 424 



2. Greek guitar, after Drieberg 424 



3. Terra eotta whistle, after Mahillon 430 



4. Babylonian whistle, after Engel 431 



5. Chinese resonators, after Amiot 431 



6. Globular whistles, after Frol^enius - - 432 



7. Globular wliistle, after Kraus 432 



8. Xylophones, after Kraus 436 



Descriptive Catalogue of the Collections of Gems in the U. S. National 



Museum. 

 By Wirt Tassin. 



1. Diagram to illustrate refraction 483 



2. Diagram to illustrate double refraction 483 



3. Nicholson hydrometer 485 



4. Emerald crystal, Stony Point, Alexander County, North C-arolina; weight, 



8| ounces. Specimen No. 83730, U.S.N.M . ." 491 



5. Corundum crystals, Ceylon. Specimen No. 81441, U.S.N.M 498 



6. Diamond crystals, Kimberly Mines, South Africa. Specimen No. 84799, 



U.S.N.M ". 504 



7. Garnet crj'stal and pebbles of pyrope. Specimen No. 82575, U.S.N.M 510 



8. Agate, Brazil. Specimen No. 44948, U.S.N.M 521 



9. Agatized wood, Chalcedony Park, Arizona. Specimen No. 82485, 



U.S.N.M , 522 



10. Amethyst crystals. Upper Providence, Pennsylvania. Specimen No. 83676, 



U.S.N.M. "- '. 523 



11. Moss agate, Sheridan, Kansas. Specimen No. 49261, U.S.N.M 525 



12. Spinel crystals, Kandy, Ceylon. Specimen No. 49163, U.S.N.M 528 



13. Topaz pebbles (gouttes d'eau), Mitchell River, New South Wales. Speci- 



men No. 83782, U.S.N.M 531 



14. The brilliant; a and li, manner in which the brilliant is derived from the 



fundamental form; c, (/, and c, top, side, and back view of brilliant with 

 58 facets; /, g, and /;, top, side, and back view of modified brilliant with 



66 facets ." 548 



15. The double Ijrilliant; top («), side {b), and back {(■) view 549 



16. The half brilliant; top (a) and side {b) view of half brilliant. In r the 



top is cut in the form of a star, then called English single cut 549 



17. The trap brilliant; to- {a), side (6), and back (c) view 550 



18. The Portuguese cut; Uj (a), side [b), and back (c) view 550 



19. The star cut; (a) front and (h) back view 550 



20. The rose cut; a and b, top and side view; c, side view of a double rose . . . 551 



21. Upper and under side of trap cut 551 



22. The step-brilliant cut 552 



23. Top and side view of table cut 552 



24. The cabochon cut; a, the single cabochon; b, the double calHK-hon; r, the 



hollow cabochon; d, flat or tallow-top cabochon; e, mixed cabochon. . . 552 



25. The zodnacal stones, with their signs (after an old i>rint ) 560 



26. The figures of the planets, with their significant stones (after an old i)rint) . 562 



