Blairgowrie, personal description of afterglow, 62 Blue sky, 74; cause of, 75, 77 Borrowing days, 117 Brocken, spectre, 89; personal description, 90; Noah's Ark, 90 Brueckner, climatic oscillations, 122 Buchan, Dr., Aitken's radiation from snow, 86; Ben Nevis, papers on, 103; _Challenger_ Reports, 114; cold of 1886, 86; east winds, 94; isobars, 115; rainfall statistics, 100; on forecasting, 121 Buchanan, Ben Nevis Observatory, 102; great prevalence of fog, 106 Buddha's Lights, of Ceylon, 72 Burns, allusions to aurora, 71, 73 Byron, storm in Alps, 50 _Challenger_ Expedition, 114; temperature, 115; thunder-storms, 116; winds, 116 Chambers on sun-spots and grain prices, 113 Change of air, 55; Strathmore to Glenisla, 56 Charles II., fog and smoke, 80 Chlorine and cloud formation, 36 Christison and colour of water, 75 Chrystal on Aitken's radiation from snow, 86 Cirro-stratus cloud, mackerel-like, 39 Climate, _Challenger_ notes, 115; cone-warnings, 120; Gulf Stream, 111; oscillations, 120; rainfall, 111; sun-spots on, 112; wooded country on, 111 Clouds, decay of, 37; distances of, 35; dry, 42; even without dust, 36; formation of, 34; height of, 34; numbering of cloud-particles, 34; sunshine on cloud formation, 35; varieties of, 35 Cone-warnings, 121 Continental winds, 98 Cyclones, 95; formation of, 96, 98; small natural, 98 Decay of clouds, 37; in thin rain, 41; process, 38; ripple markings, 39 Dew, evidence of rising, 22; experiments, 15, 16; false dew, 17; formation of, 13 Disease-germs in air, 53; causes, 53; deposited by rain, 55 Diseases, and east wind, 94; personal notes, 95 Dumfries, dust in air at, 46 Dust, condensing power, 43; from meteors, 37; generally necessary for cloud formation, 26; hazing effects, 47; numbering, 26; instruments for numbering, 27; produces afterglows, 64; produces foreglows, 67; quantity in Bunsen flame, 28; at Ben Nevis, 30; Hyeres, Mentone, Rigi Kulm, 29; Lucerne, Kingairloch, 30; when not necessary, 36 Dust enumeration, deductions on, 31 Earn, Loch, splash of drop at, 101 Earthshine, 59 Ehrenberg, on colour of water, 75 Evelyn, fumifugium, 80; remedy for smoke, 82 Falkirk, Dr. Aitken's experiments on haze, 47 False dew, 19 Fitzroy on aurora as a foreboder, 73 Fog, counter, 31; dry, 41; formation, 24; more in towns, 25; and smoke, 80 Folk-lore, 50 Foreglow, described, 66; how produced, 67 Fort William Observatory, 102 Frankland, disease-germs, 53 Franklin, lightning, 51 Gassendi, named aurora, 72 Gillespie, Dr., on weather and influenza, 107 Glasgow, fog, 81 Glass, appearing damp, 44 Glenisla, ozoned air, 56