"There will be new elements discovered, and they will fit into the empty spaces in my table."

"It is useful in this sense to make a clear distinction between the conception of an element as a separate homogenous substance and as a material but invisible part of a compound."

"If statements of fact themselves depend upon the person who observes them, how much more distinct is the reflection of the personality of him who gives an account of methods and of philosophical specu…"

"Without order, our science is nothing but a miserable collection of facts."

"The time has evidently come for the development of the internal structure of atoms."