In an experiment to test the effect of a circular fence in sheltering young trees from atmospheric pollution [cf. F.A. 25 No. 615], the degree of pollution was measured primarily by PbO2 gauges, which require expensive chemical analysis each month. Further experiments with zinc plates indicate that ...

In a small experiment on young Scots Pine, a group of 12 trees protected from wind by a rectangular fence of nursery laths 4 ft. high, with permeability 50%, had 20% better height increment than controls over a 4-year period. A larger experiment was set up in 1959 using circular fences 90 ft. in...

A lecture discussing injuries to forests, lasting destruction of vegetation, and loss of amenity in the Ruhr area, and the hygienic effects (screening, filtering, dispersal etc.) of trees and forests, and their limitations. In an example given, a Beech stand close to a lead smelter, while itself...

A survey of the performance of Corsican Pine in Britain, in relation to climate, topography and soil, has been in progress. Particular attention has been given to the tree's behaviour in areas affected by smoke in S. Yorkshire. Atmospheric pollution considerably restricts the choice of species, and ...

A summary report on a survey of colliery spoil mounds in all English, Welsh and Scottish coalfields. In all, more than 200 sites were examined, some 90 of which were completely tree-covered, The general impression is that many of these sites, particularly in rural districts, are capable of...

In view of the fact that minute traces of chlorine render even highly polluted water safe for drinking purposes Dr. Macfie thought it desirable to find out in what proportion the gas must be present to kill mosquito larvae. Stegomyia fasciata larvae, in tap water or their natural medium, were...

The author discusses past and present theories of the causation of goitre, especially the iodine deficiency theory, which presumes a natural lack of iodine in the food and water of certain places and the [img 2T221265.tif] Group of young women at Kaiyima in Sierra Leone, all wives of one ghief and...