If fifty percent of said assessments against any tract of land is paid on or before five o’clock in the afternoon of the thirty-first day of May aforesaid, then the remainder thereof will not become delinquent until the thirtieth day of November next following. The second installment of assessments shall become delinquent at five o’clock in the afternoon on the thirtieth day of November unless sooner paid and the same interest shall attach thereto as provided in the case of the delinquency of the entire assessment.