Whenever the term “irrigation district” or the word “district” shall appear in this act, it shall mean irrigation district organized under and by virtue of Chapter 20, Session Laws of New Mexico, 1919, or acts supplemental thereto or amendatory thereof; and the words “this act” appearing in the foregoing amendatory sections, may be construed as applying also to said Chapter 20, and the words “board of directors” or the word “directors” anywhere in this act shall mean the board of directors of such an irrigation district; and the following sections herein except the last are to be construed as applying only to irrigation districts so organized.