Mountains of chips, once burned as the sole way to get rid of them, are brought in huge trucks which are lifted up, cab and all, to dump their contents into bins. Movable pipes spray the chips forth, to wait until they go to be pulped and bleached for paper. Few paper mills until recently have been built in California: contamination of air or water by the evil-smelling effluents of the older pulping processes has been strictly controlled by law. Now chemists have developed processes of wood pulping that are both more efficient and free of pollutants. In one, still experimental, the waste material, even the water used in washing the chips, proves to be a fertilizer rich in nitrogen. The photograph was originally taken at Forest Products Laboratory. Photos: Ansel Adams / © Regents of the University of California