Sholom uBrocho: My brother-in-law, Rabbi S. Gourary, informed me yesterday of your desire to know my opinion about the question of an Eiruv for Manhattan. Though, because of the sanctity of Chol Hamoed, my correspondence is generally suspended during these intermediate days, I hasten to convey to you my views, this matter being, as I was told, a "דבר האבוד." As you will surely recall, the matter was raised a few years ago, when I expressed my position, which has not changed. However, since I do not know if you are fully informed of it, I will here reiterate the main points of my viewpoint relative to this matter: Firstly, as a matter of principle, where according to the Din an Eiruv can be instituted, it should be so instituted (Shulchan Aruch Orach Chaim ch. 395). Secondly, special consideration has to be given to the state of affairs and attitudes in respect of the observance of the Mitzvoth in the present day and age, which has a particular bearing on the problem under discussion. I have in mind the precaution which such an Eiruv calls for under the best of circumstances, and certainly here and now, against the possibility of the Eiruv becoming Posul. In olden days, when there was a close contact between the Jewish community ("the man in the street") and the Beth Din or Rav, the invalidation of the Eiruv, and the consequent resumption of the pre-eiruv state of the prohibition of carrying on Shabbos, could be fairly easily communicated to everyone and no harm was done. Nowadays, unfortunately the position is different. While the institution of the Eiruv would quickly become common knowledge, not only through various media of communication but also by word of mouth, the rescinding of it in case of its invalidation, would only reach those who are in contact with the Rabbinical authorities, or who attend the synagogue regularly, whereas many would remain in ignorance of the changed situation. Moreover, many of those who might get into the habit of carrying on Shabbo…