With reference to your Lordship's despatches of the 16th instant on the subject of the execution of a Greek for returning to Christianity after having embraced Islamism, I have the honour to report that I had yesterday evening an interview with M. Guizot, when I communicated to him the contents of those despatches, and also of your Lordship's instructions to Sir Stratford Canning in consequence of the aforesaid transaction; and I have now the honour to inclose a copy of the despatch which, conformably to your Lordship's instructions, I have addressed to Sir Stratford Canning informing him of what passed upon this subject between M. Guizot and me. My despatch was forwarded last night to Her Majesty's Ambassador at Constantinople, and will reach Marseilles in time to go by the steam-vessel which sails from that port on the 21st. I have, &c., (Signed) COWLEY. Inclosure in No. 20. _Lord Cowley to Sir Stratford Canning_. Sir, _Paris, January_ 18, 1844. I have received instructions from Lord Aberdeen to communicate to the French Minister for Foreign Affairs your Excellency's despatches to his Lordship respecting the execution of a Greek near Brussa who had apostatized from Islamism, as also his instructions to your Excellency, under date the 16th instant, in consequence of that transaction. I am also desired to take the earliest opportunity of acquainting you with what may have passed between M. Guizot and me after this communication. I had this evening a conference with the Minister for Foreign Affairs, when I communicated to him the contents of your despatches upon this subject, and also Lord Aberdeen's instructions to you of the 16th instant, and I am happy to be enabled to state that M. Guizot expressed his entire approbation of those instructions. He also assured me that he had signified to M. de Bourqueney, in terms not less strong than those used by Lord Aberdeen in his instructions to you, the indignation and disgust of the French Government at this transaction, affording as it did a painful testimony of the total disregard of the Porte to the remonstrances of the Allies upon a previous act of a similar kind. The Minister for Foreign Affairs then assured me that he had directed M. de Bourqueney to consult with your Excellency as to the best manner of carrying into effect the instructions of the two Governments. The Representatives of France at St. Petersburgh, Vienna, and Berlin, have likewise been directed to bring the subject under the consideration of those Courts; but M. Guizot inclines to the opinion that a separate, rather than joint, representation to the Turkish Government would be advisable. He trusts, however, that the British and French Plenipotentiaries will act in concert upon this occasion, as they have done successfully in every other transaction at Constantinople in which the Allies have taken any interest. I have, &c., (Signed) COWLEY. No. 21.