COHESION. The force which binds together similar particles. The strain which any wood or metal bears is a measure of its cohesion. The following is a tabular view of the absolute cohe sion of timber, employed in building and carpen try, showing the load which would rend a prism of an inch square, and the length of prism which, if suspended, would be torn asunder by its own weight : from, it being generally understood to be impos sible that these comparatively small regions could supply a tithe of the Mocha and Java used. Of course these countries could not, even under the most intelligent system of cultivation, a system not general there. These grades really come from Brazil and other South American countries, a state of things not difficult to believe by those who inspected the many varieties shown at the Centennial Exhibition by the Brazilian govern ment. It was extremely difficult to detect the dif
ference in form and color of the berry, a matter, however, apparent enough when the coffee was steeped. Coffee, like tobacco, owes much of its superior quality to the climate and soil upon which it is grown. Since the introduction of Brazil coffee many of the drinkers of the old time Java and Mocha seem to have forgotten the taste and fragrance of the real berry and, being accustomed to the taste of the counterfeit Java, seem well satisfied.
The metals differ more widely from each other in their cohesive strength, than the several species of wood or vegetable fibres. According to the experiments of George Rennie, the cohe sive power of a rod an inch square, of different metals, in pounds avoirdupois, with the corres ponding length in feet, is as follows: