"If she did as well as you would do, my dear," said I. "There are plenty of young women in our Boston high-schools who are going through higher fields of mathematics than are required by the architect, and the schools for design show the flexibility and fertility of the female pencil. The thing appears to me altogether more feasible than many other openings which have been suggested to woman." "Well," said Jennie, "isn't papa ever to go on with his paper?" I continued:-- * * * * * What ought "our house" to be? Could any other question be asked admitting in its details of such varied answers,--answers various as the means, the character, and situation of different individuals? But there are great wants pertaining to every human being, into which all lesser ones run. There are things in a house that every one, high or low, rich or poor, ought, according to his means, to seek. I think I shall class them according to the elemental division of the old philosophers,--Fire, Air, Earth, and Water. These form the groundwork of this _need-be_,--the _sine-qua-nons_ of a house. * * * * * "Fire, air, earth, and water! I don't understand," said Jennie. "Wait a little till you do, then," said I. "I will try to make my meaning plain." * * * * * The first object of a house is shelter from the elements. This object is effected by a tent or wigwam which keeps off rain and wind. The first disadvantage of this shelter is, that the vital air which you take into your lungs, and on the purity of which depends the purity of blood and brain and nerve, is vitiated. In the wigwam or tent you are constantly taking in poison, more or less active, with every inspiration. Napoleon had his army sleep without tents. He stated, that, from experience, he found it more healthy; and wonderful have been the instances of delicate persons gaining constantly in vigor from being obliged, in the midst of hardships, to sleep constantly in the open air. Now the first problem in house-building is to combine the advantage of shelter with the fresh elasticity of out-door air. I am not going to give here a treatise on ventilation, but merely to say, in general terms, that the first object of a house-builder or contriver should be to make a healthy house, and the first requisite of a healthy house is a pure, sweet, elastic air.