March, 1933] Agric. Research in New Hampshire 13 



Control of Apple Scab 



Increasing the pressure for apple-scab sprays from 200 lbs. per 

 square inch to 300 and 400 lbs. does not improve control, finds 0. 

 Butler. 



Substituting various sulphur sprays for lime-sulphur solution be- 

 ginning with the calyx spray gave poorer control of scab, although 

 the finish of the fruit was substantially better than that obtained when 

 lime-sulphur and arsenate of lead were used. The use of calcium arse- 

 nate in place of lead arsenate gave a finish almost as good as that ob- 

 tained with the sulphur sprays. 



Date of leaf-fall has not been found a factor of primary importance 

 in the development of the scab fungus. {Hatch Fund) 



Water Supply and Hardiness 



Is hardiness of plants affected by differences in the water supply of 

 the soil? This ciuestion was studied by S. Dunn with potted cabbage 

 plants in soil containing water in amounts equal to 50, 60, 70 and 80 

 per cent of saturation. The per cent of water in the soil was not 

 found to have any direct bearing on hardiness nor to modify in any 

 respect the wide variations in hardiness exhibited by individual plants. 

 (Admns Fund) 



Preserving Burgundy Mixture 



As preservations for solutions of Burgundy mixture, tartaric acid, 

 citric acid and sodium arsenite were found by 0. Butler to be ex- 

 tremely effective. Calcium hydrate and gelatine were not found of 

 value. Mixtures preserved with these substances were in perfect con- 

 dition after the lapse of 545 days. Sodium arsenite, however, is not 

 to be recommended because the soluble arsenic resulting is sufficient to 

 cause serious injury to beans. 



Studies were also made of the toxicity of sodium bicarbonate and 

 sodium sulphate which have at times been considered the principal 

 cause of injury produced by these washes. Neither salt proved in- 

 jurious. {Adains Fund) 



Study of Forest Recreation in Sandwich 



Professor H. R. Francis of Syracuse University spent the academic 

 year of 1931-32 as a graduate student at Durham and took as his 

 thesis subject a study of the recreation situation in Sandwich. This 

 town is at the base of the White Mountains and is therefore very 

 rough topographically. Naturally then much of the land which had 

 been cleared for tillage and pasture before the Civil War, reverted to 

 woods when the smoother western lands were opened up for settlement. 

 As a consequence there was a decrease in population from 2,744 in 

 1830 to 731 in 1930 with a corresponding abandonment of houses and 

 farmsteads. These dwellings and house sites are being gradually taken 

 up by summer residents who now own 16% of the area of the town 

 and pay 40% of the taxes. This property of the summer residents has 

 in fact been largely responsible for the increase in valuation on the 

 tax assessors' books from $592,538 in 1910 to $1,409,330 in 1930. In 



