ALTDOUGH the opinion is strongly held in the City that a Nationalist Government, will be returned to power on Thursday, uncertainty with regard to the outcome of the Election has been responsible for some curtailment of dealings during the past week. Moreover, there have been other causes affecting the markets, among them being the' diversion of activity from British to American securities.;. What may possibly prove to be the preliminaries to a fresh. boom in Wall Street are now going on, and there is no doubt, that during the past few weeks a good deal of British money has gone into the shares of American Industrial and.:Utility. Companies. A further influence which has had a restraining; effect upon Stock Exchange business has been the indication of tension between Japan and China.