altered at their will; and they IUshaull have the right to empilluiy, under cuIotn ntract oir otherwise, a getneral imanagelr, whomally or may not be a meIlmtbcr of thel board l a.,.f directors. als said board of dirnetaior maly trildet.rlmin, land whtic. said general malin..g, r shall have such duties as shall ,e de- mIDteirlnilted by the board of directors ayd tihe bayseveral officers of this co