240 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



and figured in Saunder's Refugium Botanicum. It has now been redis- 'I 

 covered in Mexico by Dr. Purpus, and may prove useful in the garden. 

 It is near E. lurida, but more attractive. — F. J. C. 



Education, Agrricultural, Progress in 1907. By D. J. Crosby 

 {U.S.A. Dep. Agr., Off. Exp. Stn., Ann. Rept. 1907; pp. 237-306; 

 figs.). — Gives a brief account of the courses proved in different parts of ; 

 the world for agricultural and horticultural education. — F. J. C. 



E3lworm in Leaves of Greenhouse Plants {Garden, Sept. 25, 



1909, p. 470). — The occurrence of eelworm in leaves of begonia, 

 especially ' Gloire de Lorraine, ' and fern leaves is noticed. The injury ; 

 is seen as brown marks on the under surface, or showing through j 

 the leaf. In the begonia the brown spots have a curious semi-trans- 

 parent appearance and are frequently put down to rust. Mites are 

 sometimes the cause of injury, but very often the microscope reveals 

 instead innumerable eelworms {Aphelenchus olesistus). It gains 

 entrance to the plant through the roots, making its way up the stem j 

 to the leaves Take precautions to see that the soil is free from the 

 pest and propagate only from healthy plants. — H. R. D. 



Elaeag-naceae, Monog-raph of. Second Part. By M. Ser- 

 vettaz {Beih. 3, Bot. Centralbl. Band 25, Abt. 2, Heft ii. Oct. 9, 

 1909, pp. 129-420; 140 figs, and bibliography). — In this volume are 

 described the biology, comparative anatomy, and embryology of the 

 order. (The First Part contains a systematic account of all the known i 

 species.) It is very difficult to give an adequate account of this im-j 

 portant work, for there is hardly a stage in the life-history of a plant, | 

 from the germination of the seed to the maturing of the fruit, that is| 

 not thoroughly described, not only anatomically but with continual I 

 references to experiments and physiology, in this paper. | 



There are many points of great interest to horticulturists. The 

 three genera, Hippophaii, Shepherdia, and Elaeagiius, seem to prefer 

 rather moist, loose, and argillo-siliceous soils, but the last-named is 

 more accommodating and grows in many soils, though not in limy 

 ground. Hippophae is of great use in fixing river-shingles, gravelly 

 land, or even sand dunes (as at Ostend), and soon ties down the 

 shifting material by its system of branching roots. Suckers may be 

 planted at three or four yards apart; the accumulation of vegetable 

 soil is much favoured by burning the bushes every third or fourth yeai 

 in late autumn or early spring. The number of thorns and spinescence, 

 generally depends essentially on the action of the environment, as tlifj 

 author 'shows by microscopic evidence and by his experiments ; there 

 are other interesting notes as to the effect of altitude, of a dry climate: 

 of culture, and of growth underground, in altering the anatomica. 

 structure of stems, roots, and leaves. He considers that H. tihetanc 

 Schlect. and H. salicifolia Don are only subspecies of H. rlia7nnoides 

 produced by the very different climates in which these species an 



