Observations upon the important object of preserving wheat and other grain from vermin, with a safe and efficacious method to prevent the great depredations that are made on those valuable articles : containing also, some cursory remarks on the national advantage arising from our export corn laws, and proving that the same happy consequences must be derived from the inclosure of our forests, common fields, and waste lands : with a calculation annexed, demonstrating the great savings which may accrue from the use of the patent artificial slate-frames, on hay stacks /