J. Q. A. Warren, corresponding member of the Royal Hawaiian Agricultural Society, at the request of members of that Society, is striving to inaugurate a system of exchange of the flora of this State for that of the Islands, the object being to propagate California trees and plants in the Islands, and the Islands' products in this State. If this movement is faithfully seconded, it will result in benefit to both countries. Most of the green-house plants of this State will doubtless thrive in the open air at the Islands, while our coniferous trees will flourish in the mountains of Hawaii, and, if cultivated, will eventually furnish that country with much-needed fencing and building material. Beyond question, many of the native ornamental and other plants and trees of the Islands can be cultivated profitably in this State. As an experiment, Warren forwarded, by the Ethan Allen, from our green-houses, Irish yew, chrysanthemums, arbutus, aga-panthus, salvias, brugmansia, plumbago, lobelias, roses, choice bulbs, and seeds. These are the first lot of hot-house plants sent from here, are in good order, and are put up in a manner to insure their safe transportation. Island plants will be forwarded here in return.

Parties in this State who will furnish Warren (at Kellogg's seed store, San-some Street, near Clay) with native plants and bulbs for shipment to the Islands, will in turn be supplied with such specimens of the Island flora as may be received. This subject of international exchange of flora is one which will doubtless engage the attention of all those in the State engaged in horticulture and floriculture. Morning Daily Call, San Francisco, Cal.