References. — The publications referred to may be had from the United States Department of Agriculture, Washington, D. C., so long as available. Teachers and pupils Should write to the State college of agriculture for publications on the Subject. All reference-material possible should be secured at the beginning of the year. Correlations. — Some Suggestions are made in connection with each lesson topic as to the utilization of this subject in Vitalizing the other subjects in the school curriculum. These correlation suggestions are' not intended as a part 'oi the lesson in connection with which they appear, but Should be used with recitations in the other subjects. Teachers in rural schools should take advantage of every opportunity to give purpose to school instruction by connecting it with the prob lems at the homes of the pupils. Note TO the teacher. — To make most effective the teaching of the lesson topics found in this publication the following points Should be kept in mind and observed: (1) A monthly or seasonal sequence plan Should be followed in the presentation of topics; (2) simple classroom exercises such as the 'working. Out of feeding rations should be performed; and (3) members of the class Should carry on home work with pigs for profit. To have real educational value this home work should meet the following requirements: (a) The work with pigs should be a part of the regular instruc tion in agriculture; (6) a definite plan should be followed in raising, feeding, and managing pigs; (c) the parents of pupils Should agree to and approve the home work of pupils; (d) the home work should be carefully Supervised by some competent person; and (e) detailed records of labor, methods, expenditures, and incomes Should be kept and reported upon in writing by the pupil.