TABLK OF CONTKNTS. 



PAGE. 



The Long- Leaf Pine and its vStrug-<,^le for Existence. W. \V. 



Ashe 1 



Nitrification. J. R. Harris 16 



The Exhaustion of the Coal Supply. F. P. Venable, 25 



Sulphur from Pyrite in Nature's Laboratory. Collier Cobb. . 30 



