THE MICROBIOLOGY OF THE ATMOSPHERE 



S2, 91,92 



Sclerochloa, pollination of, 42 

 Sclerotinia, 137 



— laxa, 165 



Sclera tium cepivonim, 199 



Scolccotrichtim, 135 



Scolytiis iiiiiltislriciliis, 165 



Scopulariopsis, 139 



Scripps Institution of Oceanography, 125, 



149 

 Scrubber samplers, 97, 98 

 Scrubbing by rain, 85-89 

 Secale, 16, 42 

 Secondary infection, flattening of gradients 



by, 165, 166 

 Sedimentation, 19-21, 65-73, 

 Se/aginel/a, 210 

 Septoria, 142 



— lycopersici, 165 

 Setaria, pollination of, 42 

 Settling of dust indoors, 159, 160 

 Sewers, air of, 160 



Shelter, effect on gradient, 179 



Ships, the air-spora of, 161 



Siberia, rust spore migration in, 188 



Sieving filters, 96 



Silicone adhesives, 104 



Sites, availability of, 162, 163 



Six-stage sampler, Fig. 18, 102-3 



SUde traps, 93-95 



Sling dispersal mechanism of Ptcridophytes, 



39 

 Slit sampler, 99 

 Smooth surfaces, 25, 26 

 Smuts, loi, 122 

 Sneeze droplets, 158 

 Snow, microbes in, 150, 152, 153 

 Solanum tiiherosum, deposition on leaves of, 



74 ; see also Potato 

 Soliilago, 212 

 Sordaria, 120, 208 

 Soredia of lichens, 38, 150, 151 

 Sorghum, pollination of, 42 

 Sources of the air-spora, 129, 130, 139, 144, 



146, 147, 196, 197 

 Space exploration, 204, 205 

 Sparganhan, pollination of, 42 

 Sphagnum, air-gun mechanism of, 39 

 Spicaria (?), 126 

 Spitsbergen, 128, 186 

 Splash-cup mechanism, 36 



— dispersal, 35, 36, Fig. 4. 

 Spontaneous generation, 2-5 



Spore deposition, 42, 62-64, 74 89, 170-80 



— orientation, 19, 72 



— output, 31 



— presentation, 34 



— trapping techniques, 90-107 

 Spores as 'impactors', 82, 83 



— as 'penetrators', 82, 83 



— shed by gravity, 34 



— shed by convection, 34 

 Sporidesmium, 134 



— Imkeri, 208 



Sporolwlomyces, 1 14, 115, 117, 1 19-21, 123, 210 

 Sporobolymycetes, 33, 38, 115, 196 

 Sporormia, 141, 145 

 Sporotrichum beiirmanni, 158 



Spraying, possible effects on the the air- 

 spora, 123, 124 

 Spruce pollen in Greenland, 183 

 Squirt-gun mechanism of ascus, 36, 37 

 Squirting mechanisms in dispersal, 37 

 Stachyhotrys, 137 

 Stagnation line in impaction, 63 

 Standard deviation of spore-cloud, 49 

 Staphylococcus albus, 126 



— aureus, 138 



— citreus, 126 

 Starch grains in air, 19 

 Stemonitis, 33 



— fuse a, 150 



Stemphylium, 116, 126, 137, 141-3, 145, 208 

 Stereum purpureum, 210 

 Stichococcus, 109 



— bacillaris, 140, 149 



— minor, 140, 149 

 Still air, 14 



Stokes's law, 14, 15, 18, 19 

 Stratosphere, 23, Fig. 3, 29, 135 

 Streptomyces, 141, 143, 208 

 Stropharia aeruginosa, 210 

 Slylonychia, 149 

 Subways, the air of, 160 

 Sugar-beet pollen, 137 

 Sunshine, effect on the air-spora, 123 

 Synchytrium endobioticum, 199 



T-3 Ice-Island, 129 



Take-off mechanisms, 31, 32, 43, 44, 194 



Tasman Sea, 146 



Taxus, 15, 41, 212 



Temperature, effect on the air-spora, 120, 123 



— inversion, 24, 27, 28 



— lapse rate, 24 



Terminal velocity of fall, 14-19, 194 

 Tetraedron punctulalum, 150 

 Tctraploa aristata, 208 

 Thalictrum, 43, 212 

 Thelephora, 120, 210 

 Thermal deposition, 85 



— precipitator, 104 

 Thermals, 28, 29 



Thermonuclear explosions, dust from, 190 



Thickness of edge, effect of, 72 



Thrashing operations, effect on air-spora, 123 



Thresholds for detection, 106 



Thrush, 6 



Thuja, 41 



Tilia, 16, 43, 117, 127, 212 



Tilletia, 17, 52-55, 80, 85, 135, 196, 210 



■ — caries {tritici), 52-55, 80, 85, 210 



Tilletiopsis, 114, 116, 117, 119, 120, 123, 210 



Topographical effect on gradients, 179 



Torula herbarum, 116, 120, 128, 208 



Transvaal Mines, 158 



Trap dose (T.D.), 58, 59 



Trapping efficiency, 59, 60, 68, 71, 75 



Trichia, 34 



Trichoderma, 126, 137, 147 



Tricholoma rulilans, 210 



Tricholomopsis rutilans, 210 



Trichophyton mentagrophytes, 103 



Trichothecium, 137, 208 



244 



