590 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



plant diseases observed in Indiana during 1906, with statement of cultural 

 methods and the fungicides employed. — M. C. C. 



Plant Diseases of Vermont. By N. J. Giddings ( U.S.A. Exp. Stn. 

 Vermont, Bull. 136. Report for 1906-7). — Report containing " Occurrence 

 of Plant Diseases in 1907," a record of " Potato- spraying Experiments," 

 supplemented by an account of " Potato Diseases and their Remedies," 

 " The Dam ping-off of Coniferous Seedlings," and some minor reports on 

 musk melon industry and Hubbard squash in storage. — A/. C. C. 



Plantae Lindheimerianae, Part III. By J. W. Blankinship. 

 (Rep. Miss. Bot. Gard. 1907, pp. 123-223. With portrait of Ferdinand 

 Jacob Lindheimer 1801-1879). — An enumeration with localities and 

 dates of numbers 449-574 in Fascicle III. collected in 1845-6, and of 

 numbers 652-754 of Fascicle IV. of 1847-8, i.e. from Compositae onwards, 

 and of species collected by Lindheimer in Comal County in 1849-1851, 

 forming Fascicle V. numbers 652-1283, of which some fifty sets are 

 available for distribution, from the Texas plants in the herbarium of Dr. 

 George Engelmann presented to the Missouri Garden. A biography of 

 Lindheimer, a bibliography of Texas botany, and a complete index to all 

 the three parts of Plantae Lindheimerianae, with names conformed to the 

 Vienna Code, are added. — G. S. B. 



Polystachya Lawrenceana. By R. A. Rolfe (Bot. Mag. tab. 8211).— 



Nat. ord. Orchidaceae ; tribe Vandeae. East Tropical Africa. Epiphyte, 

 6 inches high ; leaves linear-oblong ; inflorescence terminal, 3-6 inches 

 long ; flower yellowish-green, labellum rose-coloured superior. — G. H. 



Potato Breeding-, Some Essential Points in. By E. M. East, 

 Ph.D. {U.S.A. Exp. Stn. Conn., Bien. Rep. 1907-8: pp. 429-447).— The 

 author considers that the dropping of buds before they open, the falling 

 of flowers immediately upon opening, the failure to produce viable pollen 

 although the flowers open, and the power to produce viable pollen under 

 all normal conditions are hereditable qualities. He finds that the fluctua- 

 tions in these directions are large and are influenced by changing environ- 

 mental conditions, but no ordinary treatment will force one of the above- 

 named types across its critical point into another type. The removal of 

 tubers to encourage flowering did not effect this. It seems likely that 

 most natural fruits are formed after self-fertilization, and artificial self- 

 fertilization was followed by greater fruitfulness than cross-fertilization. 

 The normal healthy pollen is round, while the infertile pollen is shrivelled 

 and irregular. Some of the pollen grains show up to seven or eight 

 protuberances from the grains, and the author considers this to indicate 

 the multinucleate character of these grains, and that the greater the 

 number of such grains the greater the number of fruits produced by their 

 aid. It is advised to pollinate a number of flowers on each cyme, as this 

 acts as a stimulus to growth and lessens the danger of the berry falling 

 before it ripens. — F. J. C. 



Potato Diseases and Insect Pests. By T. W. Kirk, F.L.S. (N.Z. 

 Dep. Agr., Div. Biol, and Ilort., Bull. No. 7, 1907 ; 12 plates and 



