No science can exist wholly for itself alone, exerting neither a passive nor an active influence. Each science must make some use of the results acquired by allied branches of knowledge for the furthering of its own advancement, and again each must contribute from its own results toward the advancement of other sciences.

Translated by Cleveland Abbey, Jr., Congress of Arts and Science: Universal Exposition, St. Louis, 1904, The Relations Existing Between Petrography and Its Related Sciences, (p. 591)