The decision of the four Powers to conclude this treaty had not been communicated to M. Guizot. French historians have adduced the secrecy which was observed as a proof of Palmerston's malevolent intentions towards France. But no other course could have been pursued with safety. It was certain that France would not take part in coercing the Pasha,[575] and it was no less certain that she would warn him of the measures which the allies were proposing to adopt against him.[576] Inasmuch, therefore, as it was advisable that the naval commander in the Mediterranean should receive his orders before Mehemet Ali could be aware of the nature of the pressure which was to be brought to bear upon him, it was impossible to acquaint M. Guizot with the resolution of the Powers. Nor was the expediency of enabling the British fleet to forestall any hostile move on the part of the Pasha the only reason which made secrecy desirable. Although Palmerston was not apprehensive that the French government would proceed to extremities, it was possible that M. Thiers might decide actively to support the Pasha. In that case war could not be avoided and it was very necessary that Sir Robert Stopford should receive the earliest information of the intentions of his government. No communication, accordingly, was made to the French ambassador until the couriers from London had obtained a start of forty-eight hours. But, on July 17, Palmerston invited M. Guizot to call at the Foreign Office, where he read out to him a _memorandum_ acquainting him with the convention which had been concluded. The numerous efforts which had been made to induce France to co-operate with the other Powers were insisted upon, and great regret was expressed that she had not seen fit to comply with the several proposals which had been communicated to her. Palmerston then proceeded to explain the general nature of the measures of coercion which it was intended to apply to Mehemet Ali, without, however, supplying the ambassador with a copy of the treaty. Guizot, after disputing the accuracy of certain statements contained in the _memorandum_, took his departure. The situation was so grave that he must receive instructions from his government before he could discuss it.[577] CHAPTER VIII THE ISOLATION OF FRANCE