244 



JCUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Australia. Eighty-two grains of alcoholic extract was found sufficient to 

 destroy a guinea-pig. — B. N. 



Timber-growing' and Climate. By J. Simpson (Ganl. Chron. 

 p. 101 ; 16/2/1901). — Written to dispel the idea that our soil and climate 

 are in any way antagonistic to timber-growing. — G. S. S. 



Tomato Houses. By H. W. Ward (Ganl. Chron. p. 79 ; 

 2/2^ 1901). — Full and detailed instructions for building. — G. S. S. 



Trees at Les Barres. By R. {Garden, p. 370; 25/5/1901; 

 fig. of Pine Forest). — Particulars as to the development of the estate by 

 the late M. Pierre de Yilmorin and the various experiments tried. The 

 formation of the French Government School of Forestry and some 

 facilities given to the pupils are also touched upon. — H. J. C. 



Tropical Fruits. By W. J. {Garden, p. 5; 5/1/1901).— A most 

 interesting article, dealing with the various kinds of Tropical fruits, 

 particularly those of Jamaica. — H. J. C. 



Tulipa Gesneriana, Beitnige zur Kenntniss der Entwicklung des 

 Embryosackes und des Embryo (Polyembryonie). By Ernst Alfred 

 {Flora, 1891, Pt. 1, p. 37, figs, iv.-viii.). — The eight nuclei of the embryo- 

 sac are formed in the normal way, by three consecutive mitotic divisions, 

 iind the three uppermost constitute a normal egg apparatus. The con- 

 flicting statements of Treub and Mellink are explained by the study of 

 •embryo-sacs which through cultivation have developed irregularly. Cells 

 at the chalaza and the base of the nucellus, of special character, probably 

 lorm a connecting link for nutrition, and render unnecessary the antipodal 

 cells, which abort. In fertilisation the scheme of Nawaschin is realised, 

 one male nucleus fusing with the oosphere, the other joining the two 

 hitherto separate polar nuclei to form the endosperm-nucleus. The poly- 

 embryony is due to branching of the young embryo — the so-called pro- 

 embryo. This is paralleled by cases recorded m Erytlironium. A most 

 useful catalogue raisonnee of all the recorded cases of poly-embryony 

 closes the paper. — M. H. 



Tulipa WilSOniana {Gard. Chron. p. 332 ; fig. 121 ; 26/5/1901). 

 — Imported by M. Van Tubergen. It has brilliant blood-red blossoms. 



G. S. S. 



Tulips. By J. Douglas {Gard. Chron. p. 264 ; 27/4/1901).— Their 

 history, culture, &c. — G. S. S. 



Tulips, Darwin {Bev. Hort. Beige, June 1901). — These were 

 introduced about twelve years ago by Krelage. They do not degenerate 

 as many other kinds are found to do, even after eight years. M. J. 

 Burvenich describes his method of culture. — G. H. 



Turnip Disease Caused by Bacteria. By W. Carruthers and 



