646 APPENDIX. Soda Lime Magnesia . . . Oxide of iron . , Water & vol. mat. a b c d e / — — 2’77 2'87 — 1'20 — 1'3S 1-12 0-60 1-30 2’40 6’69 — 1-10 — 125 1-20 (f o 3'03) 1-60 1‘76 1‘50 l'OO 473 8’50 4*50 3-00 l g from Telkebanya by Erdmann, h of a t into by a lapidary’s wheel, burst with a - uuiu one jjay ui isianas m iNew Zealand, a = 2 386, k from Ascension, both by Murdoch, I from Moldauthein in Bohemia by Erdmann, m from Java by van der Boon Mesch:— 9 h i h I m 74'80 70-34 75-20 70-97 82-70 79-40 12-40 8-63 6-86 6-77 9-40 11-25 2-03 (£e 10-52) 6'54 6-24 2-61 4-30 1-31 0'32 — — 1-30 1-96 4-56 1 3-83 2-84 1-21 1-75 0‘90 1-67 J 1-77 1-21 6-40 3-34 1 7-57 11-41 2-45 3-03 Silica . . . Alumina . . Bed ox. iron Protox. mangan Lime . . . Magnesia Soda . . . Potash . . _ Analyses of obsidian n from Teneriffe, o of pumice from Tene- riffe, p of pumice from the island of Ferdinandea, q pumice from the volcano of Arequipa, r pumice from Ischia, s obsidian from Procida, t pumice from the Phlegrean fields, u pumice from Pantellaria, v pumice from Santorin, to pumice from Llaeta- cunga at the foot of Cotopaxi, x pumice from Lipari, y obsidian from Lipari, all by Abich :— Silica . . Silica and titan Alumina Bed ox. iron Oxide of mang. Lime Magnesia Soda . . Potash . Chlorine Water n 0 P ? r S 2-528 2-477 1-983 2-571 2-417 2-489 60-52 60-79 61-08 62-42 62 29 62-70 0-66 1-46 1-45 0-74 19-05 16-43 17-37 14-72 16-89 18-98 4-22 4-26 7-77 6-84 4-15 4-98 0-33 0-23 0-62 0-18 trace 0 39 0-59 0-62 1-46 3-25 1-24 1-77 0-19 0-79 4-02 3'28 0-60 0-82 10-63 11-25 2-85 4-74 6-21 6-09 3-50 2-95 1-82 1-55 3-98 4 - 35 0-30 } 0-04 J e 0-53 1-63 2-41 389 0-76 052 t U V to X y 2-411 2-63 2-354 2-224 2-377 2 370