ABSTllACTS. 



221 



tribe. With Solanaceje and l^mbellifer^e grafts were successfully made 

 between distinct tribes ; while with Composit^e the limit of grafting seems 

 to be the sub-family. — C. C. H. 



Grafting" Walnuts and Hickories. By G. W. 0. [Amer. Gard. 

 xxii. 331, pp. 307-309; figs. 65, 66; 27/4/196l).— The usual difficulties 

 are overcome by Mr. W. P. Corsa, of the Department of Agriculture, by 

 the use of an incubator. — C. C. H. 



Grass Land, Mixed Herbage in. By J. J. Willis {Gard. Mcuj. 



2162, p. 4 ; 5/1/1901). — Abstract account of results of experiments on 

 mixed herbage of permanent grass land conducted for many years in 

 succession on the same land at Rothamsted by Sir John Lawes and Sir 

 Henry Gilbert. The account may be useful to gardeners and others 

 having the care of grass lands.— TF, G. 



Guavas {Bev. Hort. Beige, April 1901.) — M. J. Burvenich describes 

 the tree Bsidium pyriferum as growing spontaneously in the West Indies 

 and S. America, whence the Guava has been introduced into Africa and 

 the East Indies. Several varieties are also described. — G. H. 



Hamamelis mollis. By W. J. Bean {Gard. Mag. 2468, p. 92 ; 

 16 2/1901).— A newly introduced species of Hamamelis (Witch Hazel) 

 from Central China, discovered by Dr. Henry in 1887. It was introduced 

 by Messrs. Veitch, in whose nursery at Coombe Wood it has flowered. 

 With this addition there are now three species of Hamamelis in cultiva- 

 tion.— TF. G. 



Hardy Plants in Flower in Winter. By G. Reuthe. {Gard. Mag. 

 2463, p. 20; 12/1/ 1901).— Notes on the flowering of rare Irises of the 

 Juno, reticulata, and Apogon groups in mid- winter near London, together 

 with the flowering of Croci and other bulbous plants. — W. G. 



Helianthus CUCUmerifolius {Bev. Hort. Beige, April 1901).— In 

 an article upon this species, with two illustrations, the writer points out 

 its advantages as flowering all the summer, and in being of great varia- 

 bility by seed, as it is an annual. In a group nearly every individual is 

 different, and thus it produces a remarkably good effect. — G. H. 



Helminthosporium, Diseases of Barley and Oats caused by. 



By F. Kolpin Ravn (Copenhagen) {Zeit. f. Bflanz. bd. xi. lit. 1, p. 1 ; 

 figs. 1 to 8 ; plates i, ii ; March 1901). — A research on a disease im- 

 portant to the agriculturist, and observed by us in P)ritain last 

 year. The author takes up the identification of the fungi concerned ; 

 he distinguishes two species of Helminthosporium on Barley and one on 

 Oats, and investigates and illustrates stages in the life histories. The 

 agricultural aspects of the disease and its prevention are reserved for 

 future work. — W. G. S. 



Hermaphrodism, False, and other Malformations of the Oogonia 

 of Nitella sijncarpa. By Ernest Alfred {Flora 1891, Ft. 1, p. 1, 



