A series of letters on the national importance, as well as the individual benefit, of extending the growth of fine clothing wool, by interbreeding with Spanish rams and British ewes / occasionally addressed to the editor of the Agricultural magazine ; interspersed with cursory remarks on the superiority of the smaller breeds of animals, the culture of the potatoe, and of the mangold wurzell plant as winter and spring food for cattle, &c., by Nehemiah Bartley.