The power herein granted to issue bonds shall be supplemental to and not amendatory of the provisions of chapter 125 of the Laws of 1933 Special Session, the same being Kan. Stat. Ann. §§ 80-1601 to 80-1605, inclusive, and chapters 378 and 379 of the Laws of 1937, the same being Kan. Stat. Ann. §§ 80-1601, 80-1602, 80-1603 and 80-1605.