360 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



substances might be used to attract the woodHce, and another series 

 to ascertain the most advisable poison. A series of tests with repellents 

 was also made. It was found that shced potatos given a thin covering 

 of Paris green or London purple proved most effective. London 

 purple also proved the best repellent. Kerosene emulsion as a contact 

 spray was fatal. In a greenhouse it was found that sprinkling Paris 

 green on the floor and covering it with damp boards was very effective. 

 On the first morning there were 137 dead specimens, on the second 59, 

 and on the third 21. Dusting the soil, especially along the sides of 

 tiles surrounding flower-beds, with equal parts of Paris green and 

 ground unslaked lime is an excellent remedy. The loose straw and 

 rubbish that collect around manure heaps should be raked together 

 and burnt before the manure heap is opened for use. In this way 

 many hundreds of woodlice may be collected and destroyed. — A. S. 



Woodlice, To destroy {Jour. Dep. Agr., Victoria, Dec. 1913, p. 548, 

 in article "Insect Pests of the Potato," by C. French). — Trap by 

 placing in the haunts of the woodlice pieces of parsnip, beetroot, 

 or potato cooked in a solution of arsenic. They eat these greedily. 

 They can also be trapped in large numbers by placing empty boxes 

 (or bones on top of old sacks) at the side of the garden, and into these 

 the woodlice will creep on the approach of day. If the woodlice are 

 in the ground, vaporite well worked into the soil destroys them 

 through the gas evolved. — C. H. H. 



Wood-oil Tree, The Chinese. By David Fairchild {U.S.A. Dep. 

 Agr., Circ. 108, April 5, 1913). — Valuable for wood or tung oil which 

 the nuts contain, said to be the best drying oil known, and likely 

 to revolutionize the varnish industry of the United States. The tree 

 succeeds well on heavy clay soils and in dampish situations. — A . D. 



Woods Grown in the United States, Mechanical Properties of. 



{U.S.A. Dep. Agr., For. Serv., Circ. 213, Mar6li 24, 1913). — A valuable 

 table of the various tests that have been carried out by the Forest 

 Service — about 25,000 in number. Tension, cleavage, and other pro- 

 perties are gone into. — A. D. W. 



Woods of the United States, Uses of Commercial. By 



Maxwell {U.S.A. Dep. Agr., For. Serv., Bull. 12, Oct. 11, 1913). — Beech, 

 birch, and maple would appear to be representatives of the three 

 genera that are of most value for commercial purposes. — A. D. W. 



Zinc Arsenite as an Insecticide. By J. W. Schoene {U.S.A. Exp. 

 Stn., New York, March 1913). — It is herein shown that zinc arsenite 

 is quicker in action than lead arseniate, but, on the whole, causes 

 much more spray injury to foliage. — C. P. C. 



