. Agricultural news . lls, be confirmed, wemay perhaps look to two general methods of light productionin the animal Kingdom—one as in Pholas, the oxidation withlight production of luciferin by luciferase so closely paralleledby pyrogallol and peroxida-es: the other as in Cypridina andthe firefly, through the interaction of photogenin and photo-phelein, the photogenin giving light by .some mechanismwhich can not at present be definitely stated. The closestparallel is the zymase system. Just as zymase is inactivewithout its co-enzyme so photogenin is inactive (will notemit light) without photoph
. Agricultural news . lls, be confirmed, wemay perhaps look to two general methods of light productionin the animal Kingdom—one as in Pholas, the oxidation withlight production of luciferin by luciferase so closely paralleledby pyrogallol and peroxida-es: the other as in Cypridina andthe firefly, through the interaction of photogenin and photo-phelein, the photogenin giving light by .some mechanismwhich can not at present be definitely stated. The closestparallel is the zymase system. Just as zymase is inactivewithout its co-enzyme so photogenin is inactive (will notemit light) without photophelein. ,fust as there are certainquantitative relations between zymase and co-zymase. sothere are similar quantitative relations between photogeninand photophelein. As oxygen is necessary for light production,we may, perhaps, provisionally regard photogenin as a sub-stance autooxidizable with light production only in thepresence of photophelein. 24 THE AGRICULTURAL NEWS. January 27. 1917. EDITORIAL If/ Head Office w. NOTICES. — Barbados. Letters and matter tor publication, as well as allspecimens for naming, should be addressed to theCommissioner, Imperial Department of Agriculture,Barbados. All applications for copies of the AgriculturalNews and other Departmental publications, should be?addressed to the Agents, and not to the Department. The complete list of Agents, and the subscriptionand advertisement rates, will be found on page 3 ofthe cover. Imperial Commissioner of Francis Watts, , , Agriculture for the West Indies , SCIENTIFIC STAFF. SeieiUific Assistant andAssistant Mditor Entomologists Mycologist W. R. H. A. Ballou, ,.\J. C. Hutson, , Nowell, CLERICAL STAFF. ?Chief ClerkAssistant Clerk Clerical Assistants Typist .Assistant Ti/pidAssistatil for Publications A. G. B. Connell.(L. A. Coibin. P. Taylor. Miss B. Robinson. Miss W. Eliis. A. B. Price, Fell. Journ. Ins ^Inricuttural lleiufi Vol. XVI. SATURDA
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