A guide to the choice of a site for residential purposes : high-lying, dry sites remedial and preventive of disease, and promotive of health and the enjoyment of life, from the evidence of a wide range of eminent authorities in therapeutics, climatology, etc. : considerations founded on geological facts and the benefits derived from residence on high-lying sites on the chalk, which alone, of all sub-soils in the Home Counties, can always be relied upon for dryness, even in an elevated situation / by a member of the Geologists' Association.
- Gilford, William.
- Date:
- 1887
Licence: Public Domain Mark
Credit: A guide to the choice of a site for residential purposes : high-lying, dry sites remedial and preventive of disease, and promotive of health and the enjoyment of life, from the evidence of a wide range of eminent authorities in therapeutics, climatology, etc. : considerations founded on geological facts and the benefits derived from residence on high-lying sites on the chalk, which alone, of all sub-soils in the Home Counties, can always be relied upon for dryness, even in an elevated situation / by a member of the Geologists' Association. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
![a still clear night cold air gathers in hollow places ; you often find more injury from frost in a valley than on the hill, and the cold is often sharper in the valley. On reaching a hill beyond the depression, we found it warmer.— Agricultural Gazelle^'' Dec. 5, 1881. Cold air being heavier than warm, the stratum next to the soil will, as a rule, be colder than the one above it. Hence land at the bottom of a valley will be chilled by the descent of cold air more than that higher up, so that what are called sheltered places are often in spring and autumn the coldest. The growth of the sheltered gardens in the Valley of the Thames has often been killed by frosts, whose effects were unfelt on the hills of Surrey and Middlesex.—Dr. Daubeny ou Climate. At night, and in the winter when the sun is feeble in its influence, and the surface of the ground is cooled by radiation below the superincumbent air, the particles of air resting on the ground become cold by contact with it, and, increasing in den- sity, descend the slopes of the downs and collect at the bottom of the coombes, displacing the warmer air; creeping from the coombes as shallow streams of cold air of limited extent, they gather in the wider valleys, and the descent of cold air in this way through the valleys is counterbalanced by the ascent of the comparatively warm air which it displaces, so that the hills enjoy a somewhat higher temperature than they otherwise would. In Croydon, dahlias and scarlet-runners always last longer on the higher ground, and I have known the latter espe- cially to be black and withered by frost on the lower ground weeks before they were touched on Parkhill, the highest ground in Croydon. Many half-hardy shrubs and valuable ornamental trees, I am persuaded, would stand with impunity the climate of Warlingham which would perish in some parts of the Caterham Valley.—]Mr. Storks Eaton, F.M.S., in Paper read at Meeting of Croydon Natural History Society, Api il, i88i. In discussion on the same paper, Mr. Mawley said that Mr. Stprks Eaton had proved that the atmosphere on](https://iiif.wellcomecollection.org/image/b22302669_0012.jp2/full/800%2C/0/default.jpg)
