Agricultural news . sisalana (sisal); (3) Agavefourcroydes (henequen); and (4) an unnamed varietywhich occurs locally. The second and third of thesevarieties are the only ones which are valuable as acommercial source of fibre. Mr. Jackson remarks that, although the plantshave made very slow growth, their healthy appearanceindicates that the conditions are, on the whole, suchas to favour the success of the experiment. With regard to the planting of sisal and henequen,Mr. Jackson observes that it is evident that the plantsshould not be set deeply in the soil, as is exemplifiedby the manner in wh
Agricultural news . sisalana (sisal); (3) Agavefourcroydes (henequen); and (4) an unnamed varietywhich occurs locally. The second and third of thesevarieties are the only ones which are valuable as acommercial source of fibre. Mr. Jackson remarks that, although the plantshave made very slow growth, their healthy appearanceindicates that the conditions are, on the whole, suchas to favour the success of the experiment. With regard to the planting of sisal and henequen,Mr. Jackson observes that it is evident that the plantsshould not be set deeply in the soil, as is exemplifiedby the manner in which the wild agave grows. Thelower leaves of the plants should never be covered byearth. He also advises that, until the plants attain aconsiderable height, careful weeding around them bymeans of a scutfie hoe is necessary, the ordinary agri-cultural hoe not being suitable for the purpose: theland between the row? of plants he advises to be keptclean by occasional cutlassing. 154 THE AGRICULTURAL NEWS. M\T IS, INSECT NOTES. THE VALUE OF ZOOLOGY TO HUMAN WELFARE. The above title lorined the subject for discussion bysome of the leading zoologists of the United States at aspecial symposium lield under the auspices of the AmericanAssociation for the Advancement of Science during its lastannual meeting at Pittsburg in December 1917. Eachspeaker had been assigned one general topic relating to thatbranch of zoology in which he himself is a specialist, and itwas hoped that the contributions by the various .speakersmight more or less supplement each other. The presentsymposium was also intended to supplement a former discus-sion on the same general subject held at the Philadelphiameeting of the above Association in IKHl-). Since thetime allotted to each speaker was necessarily limited, thevarious aspects of the subject could only be touched uponbriefly by the different speakers. The whole subject is imeof general interest, and some of the different topics will bereferred to later
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