FORESTRY. 



of planters in Reunion of tearing the vanilla vine from its living support al the time 

 of flowering. The symbiotic relationship of vanilla unci fungi has been previously 

 noted l E. S. I:.. 16, p. 851 |. 



Id the author's investigations the period of flowering was considerably retarded in 

 the presence of the fungus. By tearing the vine from its living support, therefore, 

 the injurious effect of the fungus is minimized and this practice is given a rational 

 explanation. 



Vanilla culture in the Hawaiian Islands, A. [nkersu i World To-Day, u 

 (1905), No. 8, /'/>. i"i.\ WIS).— An accounl of planting aboul 8,000 cuttings of 

 vanilla in the region of Kona, Hawaii, where it i< believed the climate is especially 

 suitable for this crop. 



A revised classification of roses, 1905, .1. <i. Bakes (Jour. Linn. Soc. [ /."/<- 

 don], Bot., 87 ( 1905), No. 258, />/>. 70-79). — A revised analytical key is given to the 

 various groups of roses. 



Our native orchids, W. II. Gibson and Helena L. Jellipfe I New York: Double- 

 day, Page & <'<>., 1905, />/>. AAA 17 158, pis. 58, figs. /: ).- -Illustrated descriptions 

 with key are given of the orchids native to the region from Kansas easl to southern 

 Virginia and north to Manitoba and Labrador. 



Ether forcing- without a greenhouse, Flora L. Marble [<!<tr<l. Mag. [A'. )'. J. 

 2 i 1905), No. 9, /'/>. 64, 65, figs. 7). — An account of the etherization of 2 azaleas, 2 

 lilacs, ami L' dentzias in an old-fashioned chest and their subsequent growth in the 

 living room of the house. 



By etherizing these shrubs ~- hours from November 4, blooms were secured at 

 ( Jhristmas time, t he average cost of etherizing being 15 cents per plant. < >ne azalea, 



Simon Mardner, 1 lilac, Charles X, and 1 deutzia were given a double dose of ether- 

 ization with half the quantity of ether first used. This proved especially beneficial 

 with these varieties, since the 1 dentzia etherized for only 72 hours failed to Start 

 into growth until late in the season, not producing bloom until February. 



Two examples of grafts, L. Daniel I Compt. Rend. Acad. Sci. [Paris'], 141 I 1905), 

 No. • >', pp. 214, 215). — Tall morning glory (Ipomcea purpurea) and Quamoclit coccinea 

 were grafted by the author on the sweet potato (Batatas edulis). 



The first i-' are annuals, while the sweet potato in that climate is perennial, devel- 

 oping very slowly and producing tubers only at the end of several years. On the 

 Other hand, the 1' plants mentioned first are well adapted to the climate. A.S a resull 

 of these grafts tubers the size of 1 cm. were formed at the end of the first year, the 



tubers formed when Q. <-<„;-i,,t<i was used as a Bcion being smaller than when tall 

 morning glory was used. The control sweet potatoes which had not been grafted 

 produced no tubers. 



In another instance Helianthus multiftorus, which is perennial and in that climate 

 reproduces itself exclusively by tubers, was grafted on //. annuus, a variety of -me 



flower which grows well there, producing fertile seeds iii abundance. As a result of 



this graft the //. muttiflorus scion produced a large number of flowers, one of which 



contained a fertile seed. From this seed was grown an //. multiftorus which bad 

 conserved the characters acquired by the scion. 



FORESTRY. 



Forest irrigation experiments, K. Bohmerle | Centbl. Gesam. Forstiv.,81 

 No. /'. y/'. //'"' 172, figs. 8). An account of irrigation experiment- carried out near 

 Vienna, Austria, during the years L901 t<» 1904. 



The forest was 56 years old in the beginning of the experiment and consisted of 

 Austrian pine. Tallies are given showing in detail the diameter gro* thof each of the 

 trees on the irrigated ami unirrigated plats during each year of the experiment. The 

 increment percentages on the unirrigated plat during each year was as follows: In 



