94 Edivard Livingston Youmans. 



marked this Atlas. Both publications were based on 

 the theory of binary combination ; when this was super- 

 seded by the current chemical philosophy the Chem- 

 istry was rewritten. As the new theories did not lend 

 themselves to graphic illustration, the Chart and Atlas 

 were not revised, and gradually fell out of use. 



Ever since the preparation of the Class-Book of 

 Chemistry Mr. Youmans had cherished the purpose 

 of preparing a handbook for the household. His 

 studies no less than his sympathies and tastes had led 

 him to regard the home as a field which perhaps even 

 more imperatively than the farm demanded science 

 for the relief and economy of its toil ; while the cir- 

 cumstance that so much of his time throughout the 

 years of blindness was spent indoors made him still 

 more keenly alive to the bearings of scientific studies 

 upon the processes of the household. No work of his 

 life better expresses his character than the Handbook 

 of Household Science, Avhich after several years of 

 preparation was published in 1857. He had carefully 

 studied the practical applications of science to the 

 heating, lighting, ventilation, and purification of dwell- 

 ings, and had given especial attention to the subject 

 of foods in relation to health and economy. At this 

 time he was much aided and encouraged by his excel- 

 lent friend Mr. R. H. Manning, a gentleman of wide 

 knowledge and sound judgment, who was building 

 for himself a house in Brooklyn, and was naturally 

 interested in whatever might tend to make it whole- 

 some and easy to manage. Many were the brisk 

 discussions over points in the Handbook between 

 these two keen men, each with his marked gifts of 

 expression. But on one point they were heartily 

 agreed— that the highest use of knowledge is in minis- 



