Until the end of 1651 the Readmission question presented no elements of urgency, because there was a chance of its favourable solution without its being made the object of a special effort on the part of the Government or the legislature. By the treaty of coalition proposed to the Netherlands by the St. John mission early in 1651, the Jewish question would have solved itself, for the Hebrew merchants of Amsterdam would have _ipso facto_ acquired in England the same rights as they enjoyed in Holland. That proposal, however, broke down, and as a result the famous Navigation Act was passed. The object of that measure was to exclude foreign nations from the colonial trade, and to dethrone the Dutch from their supremacy in the carrying and distributing traffic of Europe. Consequently it supplied a strong inducement to Jewish merchants—especially those of Amsterdam who were then trading with Jamaica and Barbados—to transfer their counting-houses to London. As such an immigration would have well served the policy embodied in the Navigation Act, it became desirable that some means of legalising Jewish residence in England should be found, and hence the question of Readmission was brought within the field of practical politics. This was the new form in which it presented itself. It was no longer a question of Religious Toleration or of the hastening of the Millennium, but purely a question of political expediency. It appears that the St. John mission, when its failure became probable, was instructed to study the Jewish question, and probably to enter into negotiations with leading Jews in Amsterdam. Certain it is that its members saw a great deal of Menasseh ben Israel during their sojourn in Holland, and that Cromwell’s benevolent intentions were conveyed to him. Thurloe, who was secretary to the mission, had several conferences with the Rabbi, and the Synagogue entertained the members of the mission, notwithstanding that public opinion ran high against them.[50] Strickland, the colleague of St. John, and formerly ambassador at the Hague, was ever afterwards regarded as an authority on the Jewish question, for he served on most of the Committees appointed to consider Menasseh’s petitions. Still more significant is the fact that within a few weeks of the return of the Embassy a letter, the text of which has not been preserved, was received from Menasseh by the Council of State, and an influential committee, on which Cromwell himself served, was at once appointed to peruse and answer it.[51] Towards the end of the following year two passes couched in flattering terms were issued to the Rabbi to enable him to come to England.[52]