Maxwell, James Clerk The data of the statistical method as applied to molecular science are the sums of large numbers of molecular quantities. In studying the relations between quantities of this kind, we meet with a new kind of regularity, the regularity of averages, which we can depend upon for all practical purposes, but which can make no claim to the character of absolute precision which belongs to the laws of abstract dynamics. . . molecular science teaches us that our experiments can never give us anything more than statistical information, and that no law deduced from them can pretend to absolute precision.