776 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Dendrobium x Luegerianum. By A. Hafka (Oestr. Gart. Zeit. 

 vol. viii. pt. viii. pp. 230-231; 1 fig.). — Dendrobium X Luegerianum, 

 obtained by fertilizing D. nobile with the pollen of D. X Leechianum, 

 rejoices in plenty of moisture and grows readily in Osmunda fibre. In 

 summer it does well in a cucumber house and must be frequently 

 syringed. In autumn keep in a cool house at a temperature of 55 0 F. 

 When the orchid is brought into a warm house in winter it bears a 

 large number of flowers, varying in colour from cream to dark violet in 

 the petals and sepals. The lip ranges between claret and dark purple 

 in colour. The plant should be potted in June every second or third 

 year. — S. E. W. 



Derris oligosperma (Bot. Mag. tab. 8530). — Family Leguminosae, 

 tribe Dalbergieae. New Guinea to New South Wales. Shrub, climbing 

 over 50 feet long. Leaves compound, 6 inches long ; leaflets 5-6 

 paired. Racemes 5 inches long. Flowers less than an inch long, 

 white. — G. H. 



Disease Resistance, Inheritance of. By R. H. Biffen (Jour. 

 Agr. Sci. vol. iv. pp. 421-429). — Wheat plants found immune in the 

 second generation from a cross between a badly rusted plant (attacked 

 by Puccinia glumarum) and an immune one, were found to breed true 

 to the immunity, but proved susceptible to the black rust, Puccinia 

 graminis. The degree of susceptibility among the remainder varied 

 greatly, and it is also shown that the type of manuring practised 

 affected the results. — F. J. C. 



Dracaena Hybrids. By Borsos (Oestr. Gart. Zeit. vol. vii. 

 pt. xi. pp. 331-334). — Dracaenas are best increased from cuttings, 

 inserted in pots of sandy peat, deal sawdust, or warm water. The 

 cuttings rest on charcoal and are kept in a propagator at 80-86 0 F. 



When the roots appear in two or three weeks, re-pot the cuttings 

 and gradually admit air. Now is the time to move to a temperature 

 of 65 0 F., giving the pots bottom heat, finally half bury the pots in 

 a hotbed. Syringe daily and pour water between the pots. In 

 six weeks transfer to a freshly made hotbed and re-pot if necessary. 

 In summer the plants require to be syringed four times a day, if 

 possible with rain water. The plants must not be exposed to direct 

 sunlight before September. — S. E. W. 



Drying Lumber at Atmospheric Pressure, Principles of ; and 

 Humidity Diagram. By H. D. Tiemann (U.S.A. Dep. Agr., 

 Forest Service, Bull. 104, December 16, 1912). — The Forest Service 

 has for a number of years made experiments in drying lumber, and 

 with a considerable amount of success. The two fundamental 

 principles on which success in kiln-drying depends are a proper control 

 of the two conditions, (1) heat and (2) relative humidity. Great 

 care is necessary in drying the timber, for although the strength of 

 wood increases with its degree of dryness, yet wood which has been 

 dried and resoaked is less resilient than when green. — A. D. W. 



