§ (2) In the case of any patent for an invention intended for or capable of being used for the preparation or production of iced or medicine, the comptroller shall, unless he sees good reason to the contrary, grant to any person applying for the same. a licence limited to the use of the invention for the purposes of the preparation or production of food or medicine but not otherwise; and in settling the terms of such licence and fixing the amount of royalty or other consideration payable, the comptroller shall have regard to the desirability of making the food or medicine available to the public at the lowest possible price.