THE MICROBIOLOGY OF THE ATMOSPHERE 



Erica, pollination of, 42 

 Ericaceae, pollen over the Atlantic, 127 

 Erysiphales type of spore liberation, 37 

 Erysiphe, loi, 106, 116, 118-20, 122, 152 



— granmis, 17, 19, 71, 82, 85, 94, 208 



— polygoni, 16 

 Escherichia coli, 104, 192 

 Evolution, 201-3 



Experiments on spore diffusion, 52-57 



Factories, the air-spora of, 160 

 Fagus sylvatica, 15, 16, 20, 43, 212 

 False oat-grass, see Arrhenatherum 

 Farm buildings, the air-spora of, 160 

 Favus, 6 



Fern spores in upper air, no, 140, 146 

 Ferns, spore dispersal of, 39 

 Festiica, pollination of, 42 

 Filter samplers. Fig. i, 96, 97 

 Finland, 150, 186 

 Fistulina hepatica, 210 

 Flag sampler, 96 



Flattening of gradients by secondary infec- 

 tion, 165 

 Flavobacteriiim, 126, 140, 142 



— aquatilis, 126 



Fluorescent dusts experimentally dispersed, 



182 

 Forties annosus, 89, 97, 210 

 Food preservation by heat, 3 

 Fraxinus, 43, 117, 127, 180 



— americana, 16 



Freezing, effect on viability, 192, 193 



Frictional turbulence, 23, 25-27, 194 



Fnillania, hygroscopic elaters of, 39 



Fuligo septica, 210 



Fumago, 137 



Fimaria hygrometrica, 140, 151, 210 



Fungi Imperfect!, spores of, PI. 5; see also 



genera and species involved 

 Fusarium, 34, 35, 92, 122, 137, 139, 142, 144, 



145 



— culmortim, 35 



Galera tenera, 17 



Ganoderma applanatum, 78, 81, 84, 85, 116, 



120, 123, 162, 163, 210 

 Gasteromycetes, bellows mechanism of, 35 

 Geaster, bellows mechanism of, 35 

 Gene dispersion and transmission, 167, 169- 



80, 197, 203 

 Geoglossum, 18 

 Geographical distribution of microbes, 13, 



181, 182, 184, 189, 198-200 

 Geometrical dispersion theories, 46 

 Germ theory of disease, 6 

 Glaciers, spores and pollen in, 201 

 Glass fibre sampler, 94 

 Glasshouses, 161 

 Globularia, pollination of, 43 

 Gloeocapsa, 109, 116, 123, 150, 210 

 Glycerine jelly as mountant, 103 

 Gottingen, 20, 81, 138 

 Graham Land, Antarctica, 128 

 Gramineae, polUnation in, 41 



Grass pollen, 42, 74, 117, 127 



Gravity deposition, 64, 65, Fig. 12, 68, 76-82, 



91-93 



— sedimentation trapping, 12, 91-93 



— shedding of spores, 34 

 Green-plant spores in upper air, 140 

 Greenland, 137, 186 



Ground deposition hypotheses, 76-80 

 Guelph, Ontario, 153 

 Gymnosporangitim biseptatuw, 136 

 Gyiieriutii, pollination of, 42 



Hail, microbes in, 153, 154 

 Half-life of a microbe population, 192 

 Halle, Germany, 137 

 Hayfever, 12 

 Hazel, see Corylus 

 Heat generated by fungi, 21 

 Heidelberg, Germany, 149 

 Height, change of air-spora with, 132-3 

 Helicomyces, 120, 123, 208 

 Helicosporium, 137 



Helminthosporiiim, 82, 116, 120, 128, 135, 137, 

 139, 141, i43>2o8 



— sativum, 17, 34, 35, 141 

 Helvella crispa, 208 

 Hemileia vastatrix, 93 

 Hesse's method, 10, 93 

 Hippopha'e, pollination of, 43 

 Hirst spore trap, 99-101, Fig. 17 

 Histoplaswa, 96, 200 



Holcus, pollination of, 42 

 Holland, 108, 140 

 Hordeiim, pollination of, 42 

 Horizons of infection, 183, 184 

 Horizontal surface, deposition on, 68-72 

 Hormidium flaccidum, 140, 149 

 Hortnodendrmn, 126, 134, 139 (and seeClado- 

 sporium) 



— resinae, 157 

 Hornbeam, see Carpinus 

 Hospitals, the air-spora of, 159, 160 

 H Ulnar ia gramdata, 208 

 Humtdus, pollination of, 43 

 Hygrophorus tiiveus, 210 



Hygroscopic movements in dispersal, 34, 36, 



39^41,43 

 Hyphal fragments in air, 128 

 Hypholoma fasciadare, 2 1 



— hydrophila, 210 



— velutina, 210 

 Hypnum ciipressiforme, 150 

 Hypochytriiim catenoides in air, 129 

 Hy poxy Ion coccineiim, 208 



— midtifonne, 208 



Ice, spores and pollen in, 201 



Identification of the air-spora, 91, 108, 109, 



207, Pis. 5, 6, 7 

 Impaction, 59-69, 82, 83, 93-103 



— filters, 97 



— samplers, 93-103 

 Impactors, spores as, 82, 83 



Imperial College of Science & Technology 



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