The Governor may set apart each year by proclamation 1 day to be designated as Arbor and Bird Day and may request its observance by all public schools, private schools, colleges and other institutions by the planting of trees and the adornment of the school and public grounds and by suitable exercises, having for their object the advancement of the study of arbor culture and promotion of the spirit of protection to birds and trees and the cultivation of an appreciative sentiment concerning them.