The rich and populous valley of the Kongo is being opened to commerce by a society called the International African Association, of which the King of the Belgians is the president and a citizen of the United States the chief executive officer. Large tracts of territory have been ceded to the association by native chiefs, roads have been opened, steamboats placed on the river, and the nuclei of states established at twenty-two stations under one flag which offers freedom to commerce and prohibits the slave trade. The objects of the society are philanthropic. It does not aim at permanent political control, but seeks the neutrality of the valley. The United States can not be indifferent to this work nor to the interests of their citizens involved in it. It may become advisable for us to cooperate with other commercial powers in promoting the rights of trade and residence in the Kongo Valley free from the interference or political control of any one nation. In view of the frequency of invitations from foreign governments to participate in social and scientific congresses for the discussion of important matters of general concern, I repeat the suggestion of my last message that provision be made for the exercise of discretionary power by the Executive in appointing delegates to such convocations. Able specialists are ready to serve the national interests in such capacity without personal profit or other compensation than the defrayment of expenses actually incurred, and this a comparatively small annual appropriation would suffice to meet. I have alluded in my previous messages to the injurious and vexatious restrictions suffered by our trade in the Spanish West Indies, Brazil, whose natural outlet for its great national staple, coffee, is in and through the United States, imposes a heavy export duty upon that product. Our petroleum exports are hampered in Turkey and in other Eastern ports by restrictions as to storage and by onerous taxation. For these mischiefs adequate relief is not always afforded by reciprocity treaties like that with Hawaii or that lately negotiated with Mexico and now awaiting the action of the Senate. Is it not advisable to provide some measure of equitable retaliation in our relations with governments which discriminate against our own? If, for example, the Executive were empowered to apply to Spanish vessels and cargoes from Cuba and Puerto Rico the same rules of treatment and scale of penalties for technical faults which are applied to our vessels and cargoes in the Antilles, a resort to that course might not be barren of good results. The report of the Secretary of the Treasury gives a full and interesting exhibit of the financial condition of the country. It shows that the ordinary revenues from all sources for the fiscal year ended June 30, 1883, amounted to $398,287,581.95, whereof there was received--