410 MISSOURI STATE HORTICULTURAL SOCIETY. 



steam is condensed by reconversion into water, this enormous quantity 

 of heat is liberated and becomes sensible heat, available to warm the 

 surrounding air, both by radiation and conduction, or by immediate 

 contact. A careful study of the operation of this beautiful law will 

 render clear the fact, so mysterious otherwise, that a comparatively 

 small radiating surface heated by steam should prove sufficient to heat 

 a large volume of air without at any time itself passing the limit of 

 312°. The latent heat of steam is 1728°. S. F. T. 



FORESTRY. 



RAPID GROWTH OF THE SOUTHERN YELLOW PINE. 



We have always maintained that the newspaper dread of a tim- 

 ber famine comes from ignorance of American forest trees, and from 

 a study only of English forest literature. In that country trees grow 

 slowly ; in our country they grow rapidly. As soon as there is the 

 slightest chance of a scarcity here, and that there is a profit in its growth, 

 forests will be planted, and we can soon get all we want. The Fcorida 

 Dispatch tells us that in good southern pine lands so great is the growth 

 of Pinus pahistris^ that in twenty-five years it is large enough to cut 

 for timber. Instead of legislation to preserve old rotten forrests, it 

 will be to the profit of the nation to encourage the clearing as rapidly 

 as possible, so that new planting may take their place. 



Dr. W. Thornton Parker, in the Sanitarian, puts the case in a very 

 sensible way, and we quote parts of an article which is very readable 

 to the end. 



He says: "For many years our people have given considerable 

 attention to this subject of forest culture, but instead of exercising 

 their influence in the direction of forest culture and protection where 

 it is most needed, many seem to content themselves with planting as 

 many trees as possible in our parks and streets and on their private 

 grounds in our cities and towns. This love for the beauty of foliage 

 has often been too extravagantly bestowed, and the societies formed 

 for the planting are not always under the direction of the wisest, and 

 the planting, from a sanitary point of view, has not yet received much 

 attention. To plant as many trees as possible seems to be the only 



