By my late instructions, of which your Excellency has a copy, I am to inform myself concerning the progress of American negotiations at the Court of Spain, and, if an alliance shall have been entered into between his Catholic Majesty and the United States, to invite his Catholic Majesty into the alliance proposed between France, their High Mightinesses, and the Congress. If no such alliance shall have been formed, to receive his Catholic Majesty, should he manifest a disposition to become a party, &c. Congress have wisely enjoined it upon me, to confer in the most confidential manner with your Excellency, and I have made it a law to myself, to take no material step in this negotiation without your approbation; but my instructions seem to make it necessary to take some measures, at least, to sound the disposition of the Spanish Ambassador. I would, therefore, beg leave to propose to your consideration, and to request your opinion, whether you think it advisable for me to do myself the honor of making a visit to the Spanish Ambassador, and communicating to him the substance of my instructions, as far as it relates to the Court of Madrid; or whether it would be better to communicate it by letter; or whether your Excellency will be so good as to take upon yourself this communication, and inform me of the result of it? I am advised here to wait on the President of their High Mightinesses as soon as possible, and demand a categorical answer to my former proposition, and then to wait on the Grand Pensionary and Mr Secretary Fagel, and, in turn, upon the Pensionaries of all the cities of Holland, to inform them of the demand made to the President. But I submit to your consideration, whether it will not be expedient to communicate the project of a triple or quadruple alliance to some confidential members of the States; as to the Pensionary of Dort, Haerlem, and Amsterdam, for example, with permission to them to communicate it, where they shall think it necessary, in order to give more weight to my demand? The Court of Great Britain are manifestly availing themselves of the mediation of Russia, in order to amuse this Republic, and restrain it from exerting itself in the war, and forming connexions with the other belligerent powers, without intending to make peace with her upon any conditions, which would not be ruinous to her. It is, therefore, of the last importance to Holland, as well as of much consequence to the other belligerent powers, to draw her out of the snare, which one should think might be now easily done by a proposition of a triple or quadruple alliance. Tomorrow morning at ten, I propose to do myself the honor of waiting on your Excellency, if that hour is agreeable, in order to avail myself more particularly of your sentiments upon these points. In the meantime, I have the honor to be, &c. JOHN ADAMS. * * * * *