354 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



tubers. These latter are very easily bruised, and for shipping must be 

 handled with great care. 



Jersey Sweets and Southern Sweets are the best known on the market. 

 The first have the best reputation for packing and grading, but just as 

 good tubers can be produced in the Southern States, where, however, 

 methods of marketing are old-fashioned and unsatisfactory. 



Storing prolongs the season, which is from August to May, but only 

 sound tubers should be kept for this purpose. Canning and desiccating 

 sweet potatoes form an important industry in several States. 



Eecipes for cooking are given, and it should be borne in mind that 

 though twenty minutes' cooking renders the tuber eatable, its flavour is 

 infinitely improved by an hour in the oven. 



In 1900 a partially successful attempt was made to introduce 

 American Sweet Potatoes to the English and French markets. " It will 

 be necessary to educate the Britisher up to them," but that done, experts 

 consider that a remunerative trade might be built up. They can only be 

 imported into France as 'yams,' potatoes being prohibited. — G. H. C. 



Temperature, Abnormally High, A List of Plants which have 

 benefited by. By E. Morel (Rev. Hort. Jan. 1, 1905, pp. 21-23).— 

 A very interesting list of outdoor plants which have flourished unusually 

 under trying conditions of heat and drought ; compiled as a guide to 

 planting in exposed positions. — C. T. D. 



Terms used in Forestry and Logging- (U.S.A. Dep. Agr. Bur. 

 Forestry, Bull. 61). — This is a useful compilation of some of the terms 

 used in forestry and logging, and will meet a want that has long been 

 felt, especially by those who are outside the life of the forester and 

 lumberman. I cannot but think that our term ' leaf-canopy ' is 

 preferable to and more understandable than 'crown-canopy,' and might 

 with advantage be substituted. There are many omissions, such as notch 

 planting, stubbing, bark-stripping and flawing, coppicing, timber haulage, 

 lopping and foreshortening branches, and laying in a tree preparatory to 

 felling. 



But additions are asked for ; and altogether the work, of some fifty 

 pages, must prove both instructive and useful. — A. D. W. 



Tetratheca thymifolia. By L. Farmer (Bot. Mag. tab. 8028).— 

 Nat. ord. Tremandracece ; E. Australia. — A much-branched under-shrub. 

 Leaves verticillate, flowers tetramerous, petals rose-coloured, 4 lines long. 



67. H. 



Timber, Preservation of. By H. von Schrenk ( U.S.A. Dep. Agr. 

 Bur. of Forestry, Bull. 51, 1904; 6 figs.). — The results of the treatment 

 of various timbers with the object of checking decay are given in this 

 bulletin. The timbers were laid as railway ties in Texas, where they 

 would be subject under normal conditions to rapid decay. The untreated 

 timbers, particularly hemlock, tamarack, loblolly pine and beech, showed 

 marked decay, and long-leaf pine almost as much, while oak showed 

 greater resistance. Timbers treated with zinc chloride, the Wellhouse 

 treatment, the Allardyce treatment and spiritine treatment show 

 practically no signs of decay. Other treatments were tried, but the 



