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19146 documents, page 1 of 1915

Sôbre os inimigos naturais da lagarta das palmáceas Brassolis sophorae sophorae (L.) (Lep., Brassolidae)

Brassolis sophorae (L.) (Lep., Brassolidae) is an old and important pest of some Brazilian Palmae, among which Cocos nucifera L. and Copemicia cerifera Mart, are the most valuable economically. Eggs are attacked by Anastatus reduvii (Howard) (Eupel-midae) and Telenomus sp. and Telenomus nigrocoxdlis Ashmead (Scelionidae), the larvae being destroyed by Withemia pinguis (F.) (Tachinidae). Six other insects devellop inside the pupae : Xanthozona melanopyga (Wiedmann) and Belvosia sp. (Tachinidae...

複雑硫化鑛の浮選試験

The complex ore from Osarizawa mine, Taihei Mining Co. was used as the sample. It consists mainly of galena, zincblende, chalcopyrite, pyrite, quartz and barite, and was analysed 1.21% of Cu, 3.27% of Fe, 8.62% of Pb and 12.39% of Zn. The degree of liberation of the constituent minerals in the sample ground 80% of -150 mesh in size was calculated by the theoretical equation after Prof. A. M. Gaudin to be 79.5?89.6% for galena, 87.2?93.7% for zincblende, 65.9?81.9% for chalcopyrite and 31.8?56...