"Discrepancy between theory and practice, which in sound physical and mechanical science is a delusion, has a real exi…"

"An essential distinction exists between two stages in the process of advancing our knowledge of the laws of physical …"

"A physical theory, like an abstract science, consists of definitions and axioms as first principles, and of propositi…"

"A hypothetical theory is necessary, as a preliminary step, to reduce the expression of the phenomena to simplicity an…"

"The evil influence of the supposed inconsistency of theory and practice upon speculative science, although much less …"

"[O]f that scientifically practical skill which produces the greatest effect with the least possible expenditure of ma…"

"With respect to those works which, from unscientific design, give way during or immediately after their erection, I s…"

"But a class of structures fraught with much greater evils exist in great abundance throughout the country—namely, tho…"

"Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fa…"

"The hypothesis of molecular vortices is defined to be that which assumes — that each atom of matter consists of a nuc…"