Kenilworth depositing floors, 47 Kimberley, 6 -- blue ground, 10 -- mines, 14, 23, 34 -- Mine in old days, 25 -- -- at the present day, 34 -- -- characteristics of diamonds from, 63 -- shales, 15 -- West Mine, 15 -- -- -- characteristics of diamonds from, 66 Kirsten’s automatic diamond collector, 57 Klipdam, 8, 23 Koffyfontein Mine, 14 Koh-i-noor diamond, 80 -- hardness of, 91 Kyanite, 20, 71 Lamp, ultra-violet, 97 Leicester Mine, 15, 23 -- -- characteristics of diamonds from, 67 Loterie d’Angleterre diamond, 80 Lustre of rough diamonds, 56 Machinery for washing and concentrating, 49 Macles, 86 Magnetite, 20, 71 -- density of, 93 Maskelyne on diamonds, 1 Matabele, 12, 39 Matrix of diamond, 67 Melaphyre, 10, 16 Melting-point of carbon, 110 Meteor, Canyon Diablo, 136 Meteoric diamonds, 134 Meydenbauer on meteoric diamonds, 135 Mica, 20, 71 -- density of, 93 Moissan’s experiments on the genesis of diamond, 115 Mud volcano, 24 Nassak diamond, 80 Natal, coal in, 6 Natural formation of diamond, 127 Newlands Mine, 15 -- -- characteristics of diamonds from, 67 New Rush diggings, 26 Nizam of Hyderabad diamond, 80 Noble, Sir A., experiments, 122, 131 Noteworthy diamonds, 76 Octahedral crystals of diamond, 63, 86 Olivine, 20 -- diabase, 16 Orange River Colony, coal in, 6 -- -- -- diamonds in, 14 Orloff diamond, 80 Pasha of Egypt diamond, 80 Paterson, Mr., description of Kimberley in old days, 25 Peridot, 20, 139 Peridotite, 3 Perofskite, 20 Phosphorescence of diamonds, 96 Phosphorus, refractive index of, 103 Physical properties of diamond, 89 Picking tables, 51 Pipes or craters, 18 Pitt diamond, 80 Polarised light and diamond, 104 Pole Star diamond, 80 Pondos, 39, 42 Premier Mine, 15, 76 Prodigious diamonds, 76 Pseudobrookite, 20 Pulsator, 52 Pyrope, 70 Quartzite, 16, 20 -- density of, 93 -- refractive index of, 103 Radio-activity of diamond, 109 Radium, action on diamond, 108 “Reef,” 21 Refractive indices, 103 Refractivity of diamond, 102 Regent diamond, 80 Reunert, Mr., description of Kimberley Mine, 30 Rhodes, Cecil John, 34 River washings, 7 Rock shafts, 43 Röntgen rays, diamond in, 107 Ruby, refractive index of, 103 Rutile, 20 Sahlite, 20 Sancy diamond, 80 Savings of the native workmen, 41 Scalenohedron diamond crystal, 86 Serpentine, 19 Shafts, rock, 43 Shah diamond, 80 Shales, Kimberley, 15 Shangains, 39 Shells in blue ground, 21 Shot boart, 81 Silver and thallium, nitrate of, 94 Smaragdite, 20 Soft blue ground, 47 Sorting the diamantiferous gravel, 55 Specific gravity, _see_ Density Spectrum, absorption of diamond, 101 Sphalerite, 100 Spinthariscope, 108 Sprat’s _History of the Royal Society_, 1 Sprouting graphite, 84