Those streets shall be numbered on what is known as the Philadelphia or St. Louis plan of 100 numbers to each block and one number for each 25 feet as base lines, beginning with the number 100 at each base line, North, South, East or West, as the case may be. Even numbers shall be assigned to the east and north sides of each block, odd numbers to the west and south side of each block. All streets that neither touch nor cross either of said base streets shall be numbered in the same manner as though they crossed said base streets.
('71 Code, § 5-9-3)