Agricultur. — Horticultur. — Forstbotanik. 431 



acre for rent. The roots obtained yielded about 29 per cent of starch, 

 the cost of the product, including cultivation expenses being £ 8 per 

 ton. Each ton of starch yielded in its inanufacture l'/a tons of dry pulp, 

 of vaiue as a food stuff for cattle and pigs and worth about £ 3 per ton. 

 Chemical analyses of the starch produced and the pulp are given. 

 The Chief requirements for the success of the industry are: 



1. Capital for installling the best „plant". 



2. Lands of light texture in a district of moderate rainfall, capable 

 of being cultivated by implements, and within easy reach of the 

 factory. 



3. A good water supply, with a System of sand filtration and a 

 caned tank for sterning pure water. 



These conditions obtain on large areas of alluvial soll on the south 

 side of Jamaica, where bananas languish in ordinary seasons for lack 

 of water. W. 0. Freeman. 



Lewis, F., Forestry in Ceylon. (Ceylon Handbook to 

 St. Louis World's Fair. p. 105 — 114.) 



The forest flora of Ceylon forms five distinct zones, which, with 

 their typical species are as follows: 



Arid Zone, rainfall 35 to 50 inches per annuum. 



Salvadora persica, Acacia planifrons, Randia dumetorum, Zizy- 

 phiis Jiijtiba, Z. riigosa, Tribiihis terrestris. 

 Dry Zone_, rainfall 50 to 170 inches per annum. This zone ab- 

 sorbs about three fifths of the country. 



Crataeva Roxburghü, Cassia Fistula, Mimiisops hexandra, 

 Chloroxylon Swietenia (satinwoodi, Diospyros Ebeniim (ebony), 

 Benya Ammonilla (Trincomalee wood), Polyalthia longifolia, 

 Sch'leichera trijiiga, Adina cordifolia, Gyrocatpiis Jacqiiini, Strych- 

 nos Niix-vomica, Euphorbia antiquorum, Hemicyclia sepiaria. 

 Intermedia te Zone, rainfall 70 to SO inches. 



Albizzia odoratissiina, Holoptelea integrifolia, Tetrameies niidi- 

 flora, and frequently species that extend into the dry zone. 

 W e t Zone, rainfall 80 to 300 inches. 



Wormia triquetra, Garcinia terpnophylla, Vater ia acuminata, 

 V. Roxbnrghiana, Dipterocarpiis zeylanicus, Shorea oblongifolia, 

 Elaeocarpus serratus, Euodia Roxbnrghiana, Campnosperma zey- 

 lanicum, Pericopsis Mooniana, Anisophyllea zeylanica, Palaquiuni 

 grandis, P. petiolare, Diospyros Gardneri, Myristica lanrifolia, M. 

 Horsfieldia, Machilus macrantha, Glochidion zeylanicam. 

 Mountain Zone. 



Michelia nilagirica, Calophyllum Walkeri, Gordonia zeylanicUy 

 Elaeocarpus serratus, Rhodoniyrtus tomentosa, several Stryraceae, 

 Rhododendron arboreum. 



The most valuable Orders in Ceylon, from the foresters point of 

 view^ are the Meliaceae, Dipterocarpaceae, and Ebenaceae. 



A resume is given of the forestry Organization in Ceylon^, and 

 notes on the production and export of some of the chief products of the 

 forests. W. G. Freeman. 



NOBBE, F. u n d J. Simon, Zum Wirthswechsel der Cus- 

 ciiia- Arien. (D. landw, Versuchsstationen. LXI. 1904. 

 p. 313—317.) 



Einige Seidearten gehen auf mehrere Arten als Wirthspflanzen über. 

 Bezügliche Versuche wurden auch vom Verf. angestellt, speciell um für 

 die traubige Seide Cnscufa racemosa Marl, die Fähigkeit, verschiedene 

 Pflanzen auszunutzen, festzustellen. Es wurde Seidesam.en mit Samen 

 verschiedener Culturptlanzen ausgesäet und es wurden Seidepflänzchen 



