The microclimate and microclimatic research; midday heat exchange at the ground surface. The incoming radiational type: nocturnal heat exchange at the ground surface. the outgoing radiational type; true heat conduction. The normal course of ground temperature; Eddy diffusion and its significance; long wave radiation; the warming process; the cooling process; the diurnal and annual course of temperature near the ground; the temperature gradient near the ground; other meteorological elements near the ground; humidity ralationships; wind relationships; optical and acoustical phenomena. Content of Dust, Carbon dioxide and emanation; the temperature of the ground surface; the influence of the type and condition of the soil; the air layer over water; the air layer near snow; the air layer abore a sod cover; on the quantitative determination of the heat economy of the ground surface; the microclimate in its relation to topography, to plants animals and man; the influence of topography; cold air floods and cold air dams; nocturnal temperature relationships in valleys; cold air winds (down-valley and glacier winds); the sunniness of different slopes; microclimatic effect of different exposures to sunshine; the skin of air on mountain slopes; more on the influence of topography; concerning the range of validity of meteorological stations; the microclimate of caves; the heat economy of plants, and plant temperatures; radiation and temperature relationships in a low plant cover; humidity and wind relationships in a low plant cover; forest meteorology, forest climatology and stand climate; radiation relationships in an old stand; temperature and humidity relationships in a old stand; wind and precipitation in an old stand; the influence of the make-up of the stand on its climate; the microclimate of circular slashings, clearings and cuttings; the climate of the stand border; the animate world and the microclimate; the unintentional effect of man on the microclimate; the city climate; the conscious modification of the microclimate by man; desdrucitve frost as a microclimatic phenomenon; the battle against destructive frost.