An open fireplace secures due ventilation--Evils of substituting air-tight stoves and furnace heating--Tendency of warm air to rise and of cool air to sink--Ventilation of mines--Ignorance of architects--Poor ventilation in most houses--Mode of ventilating laboratories--Creation of a current of warm air in a flue open at top and bottom of the room--Flue to be built into chimney: method of utilizing it. V. STOVES, FURNACES, AND CHIMNEYS. The general properties of heat, conduction, convection, radiation, reflection--Cooking done by radiation the simplest but most wasteful mode: by convection (as in stoves and furnaces) the cheapest--The range--The model cooking-stove--Interior arrangements and principles--Contrivances for economizing heat, labor, time, fuel, trouble, and expense--Its durability, simplicity, etc.--Chimneys: why they smoke and how to cure them--Furnaces: the dryness of their heat--Necessity of moisture in warm air--How to obtain and regulate it. VI. _HOME DECORATION._ Significance of beauty in making home attractive and useful in education--Exemplification of economical and tasteful furniture--The carpet, lounge, lambrequins, curtains, ottomans, easy-chair, centre-table--Money left for pictures--Chromes--Pretty frames-- Engravings--Statuettes--Educatory influence of works of art--Natural adornments--Materials in the woods and fields--Parlor-gardens--Hanging baskets--Fern-shields--Ivy, its beauty and tractableness--Window, with flowers, vines, and pretty plants--Rustic stand for flowers--Ward's case--How to make it economically--Bowls and vases of rustic work for growing plants--Ferns, how and when to gather them--General remarks. VII. _THE CARE OF HEALTH._ Importance of some knowledge of the body and its needs--Fearful responsibility of entering upon domestic duties in ignorance--The fundamental vital principle--Cell-life--Wonders of the microscope --Cell-multiplication--Constant interplay of decay and growth necessary to life--The red and white cells of the blood--Secreting and converting power--The nervous system--The brain and the nerves--Structural arrangement and functions--The ganglionic system--The nervous fluid--Necessity of properly apportioned exercise to nerves of sensation and of motion--Evils of excessive or insufficient exercise--Equal development of the whole. VIII. _DOMESTIC EXERCISE._ Connection of muscles and nerves--Microscopic cellular muscular fibre--Its mode of action--Dependence on the nerves of voluntary and involuntary motion--How exercise of muscles quickens circulation of the blood which maintains all the processes of life--Dependence of equilibrium upon proper muscular activity--Importance of securing exercise that will interest the mind. IX. _HEALTHFUL FOOD._