276 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Oat Smut in Wisconsin. By R. A. Moore (U.S.A. Exp. Stn. 

 Wisconsin, Bull. a. 98 ; 1903).— From reports and investigations in this 

 State it La estimated that the loss from Oat smut in 1902 was not less 

 than 17 per cent, of the crop ; that the value of this loss was not less 

 than five million dollars ; that practically all this loss can be saved by 

 the formaldehyde treatment, if the directions are carefully followed; 

 that no fewer than 10,000 farmers successfully treated seed Oats to pre- 

 vent smut in the past season ; that the strength of solution advisable in 

 which to submerge Oats is made by pouring one pint of 40 per cent, 

 formaldehyde into 36 gallons of water. Seed Oats enclosed in gunny 

 Backs to be submerged for ten minutes and then exposed to dry. 



M. C. C. 



Oehnaceae, The. By Ph. van Tieghem (Ann. Sc. Nat. (Bot.) xvi. 

 pp. KJ1-416 ; 1902). — An important monograph on this order of tropical 

 plants. The size of the order has been increased from about 150 

 species to 53 genera, including 473 species, of which 2G0 are new. The 

 \w\\ species include many discovered within the last ten years. There 

 has also been a certain amount of transference of genera and species 

 formerly placed in other groups. The arrangement of the matter makes 

 the paper easy of reference, although it is very detailed. The first part 

 gives the general anatomical features of the group : structure of stem, 

 leaf, root, inflorescence, flower, fruit, and seed. The divisions of the order 

 are described, and the grouping of the genera is given as a table (p. 201). 

 The greater part of the paper is occupied by a detailed account of the 

 genera and species. In this part, besides the purely descriptive matter, 

 there are notes on the discovery of many of the species and on the 

 synonymous names. The work is indispensable to those having occasion 

 to work amongst the Oclinacece. — W. G. S. 



Odontoglossum crispum, Varieties (Orch. Ecu. p. 93; March 

 1903). 'Odontoglossum crispum 'Mrs F. Peeters,' 0. c. 'Marie,' 0. c. 

 • Mat ic Corelli,' are described, and pointed remarks are made with respect 

 to the distinction in the numerous varieties of O. crispum. — II. J. C. 



Odontoglossum x lepidum. By E. A. Rolfe (Orch. ficv. p. 35 ; Feb. 

 L908 . tnteresting particulars of this natural hybrid and its synonyms 

 ue given. — II . J. C. 



Odontoglossum x waltonense (Orch. Rev. p. 49, fig. 14; Feb. 

 1908). — A photographic illustration of this hybrid, derived from the inter- 

 ing of 0. crispum and O. Kegeljani (polyxanthum), and interesting 

 particulars arc given. If. J. C. 



Olearias. By S. W. Fitzherbert (Garden, No. 1642, p. 313; 9/5/08.). 

 Though 0. OunwUma is not bo hardy as its New Zealand relative 0. 

 Ifaastii, it is not exceptionally tender, and good bushes of it may be seen 

 in Berefordsbire, a. stellulata was for some years considered a distinct 

 pedes, hut i. no W only recognised as a variety of 0. Gunniana. Many 

 11 111 catalogue them as distinct, and that sold as 0. stcllulata 

 fcppean to have larger flowers, the petals of which are a trifle more 



