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Peiototite, 17, 42, 68
— analyses, 64
Perovskite,
29, 31, 32, 33, 34, 36 Petzhold, A., 44 Picotite, 36
Picrite-porphyrite, 50 ' Pipes,' volcanic, 4 Pleistocene depression, 38
Porphyritic lava, 51 Pyroxenic minerals, 19
Quartz, liquid carbonic acid in, 43
Rammelsberg, C. F., 28, 48
Rath, G. Vom, see Voni Eath
Eeunert, T., 40
Eeusch, H. H., 53
Beyer, E., 55
Boot, 0., 60
Eoscoe, Sir H. E., 51
Eosenbusch, H., 9, 18, 23, 26, 49, 58
Both, J., 54
Eussian diamonds, 29
Eutile, 16
Sandstone in volcanic ' pipes,' 4 Saude, Ben, 32 Sauer, A., 33, 34 Schrauf, A., 23 Serpentine, 7, 12, 21, 38, 68
— analysis, 61
Shale fragments surrounded by cal-
cite, 46 Shale in volcanic ' pipes,' 4 Shaw, J., 3, 9 Sjogren, 37
Smaragdite, analysis, 19 Sorby, H. C, 44 Sphene, 38
Stelzner, A., 34, 48, 49 Stone, Sir J. B„ 45, 69
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Stow, G. W., 3, 7
Syracuse (N.Y.), Kimberlite, 56, 58
Syssersk (Urals), 29
Talc, 38
Titanic iron in perovskite, 33
Titaniferous magnetite, 30
Tornebohm, A. E., 23, 37, 49
Tourmaline, 38
' Trapp-eisenerz,' 36
Tremolite, 14, 38
Triassic (post-) age of diamond. 7,10
Tschermak, G., 20, 22, 32, 49, 50, 57
Umted States, Kimberlite, 50, 58 Urot Mines, 2
Vaal Eiver diggings, 1
— dykes, 9 Vaalite, 5, 28
— analysis, 28 Vanuxem, L., 58
Volcanic intrusions in Karoo beds, 7 Volcanic ' pipes,' 4 Vom Bath, G., 22, 37
Wapswobth, M. E., 23, 53, 54
Wales, volcanic breccia in, 55
Wiik, F. J., 22
Williams, G. H., 26, 35, 58, 60
Wohler, F., 44
Wright, A. W., 43
' Yellow ground,' 3, 62
Zeolites, 39
Zirkel, F., 13, 26, 27, 33, 43
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