634 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Inoculations of young palms with B. coli isolated from animals 

 gave exactly the same symptoms as the typical bud-rot. 



The bud-rot of coconut palm seems to be a very serious one in the 

 American Tropics. The disease progresses very rapidly and as it 

 starts in the minor tissues of the main bud, no sprays, &c., are of 

 any avail. 



The disease is also reported from other parts of the world — in 

 Ceylon, British India, Philippines, German East Africa, &c., and 

 especially in Cuba. 



It is believed that birds and insects are carriers of the disease. 

 It causes an evil-smelling rot in the bud. 



It is recommended to cut down and burn all diseased trees, 

 debris, fallen nuts, &c. 



Good figures are given. — D. M. C. 



Codling- Moth and its Control on Pears in California, Life- 

 History of the. By S. W. Foster {U.S.A. Dep. Agr., Bur. Entom., 

 Bull 97, pt. ii.; April 1911; 1 plate, 9 figs., 51 tables).— Two, and 

 preferably three, sprayings are advised, using arseniate of lead (4 lb. to 

 100 gallons of water). The first application to be made as soon as 

 the petals fall, the second treatment three to five weeks later, and the 

 third about two weeks before the picking commences. — V. G. J. 



Coffea Species, A Morpholog^ical and Physiologrical Investi- 



g^ation of the Flowers of. By Dr. F. 0. von Faber (Ann. Jard. 

 Bot. Buit. ser. ii. vol. x. pt. i. pp. 59-160; 1912; 12 plate-O-— - 

 This memoir contains a minute and careful description of the chief 

 morphological and cytological facts connected with the flower of the 

 coffee plant. 



The ovule possesses only a single integum.ent, which is a massive 

 structure, whilst the nucellus is very small and almost limited to the 

 embryo-sac. Usually only a single ovale develops in each loculus of 

 the ovary, but in cases of polyembryony two or three such ovules 

 develop in each loculus. In the development of the embryo-sac the 

 mother-cell divides into four daughter-cells, oi which the uppermost 

 becomes the embryo-sac. The somatic chromosomes number sixteen, 

 whilst the reduced number is eight in this plant. The cytological 

 details of the reduction division in the development of the embryo-sac 

 and also in the pollen-development are carefully described. Fertiliza- 

 tion is next dealt with. Double fertilization was observed. The 

 formation of the endosperm and the development of the embryo and 

 seed-coats are then touched upon at some length. The cases of poly- 

 embryony are then noted. The author concludes that where more 

 than one embryo spring from one seed of coffee these most probably 

 arise from the simultaneous development of two separate ovules in 

 one loculus of the ovary, and that they do not form cases of true 

 polyembryony. Experiments and observations upon the pollination 

 of the coffee blooms are next described. Self-pollination takes 



