Meanings of merely empirical in English

Its claims have been merely empirical, and its curative methods those of a blind art:-

I saw soon that every other method would have been merely empirical, a mere piecemeal of imagination and fact.

But, further, a merely empirical statistical law will only be true as long as the causes influencing the event remain the same.

The quality of sensation is in all cases merely empirical, and cannot be represented à priori (for example, colours, taste, etc.).

Hitherto medicinal herbs have come down to us from early times as possessing only a traditional value, and as exercising merely empirical effects.

He would devote his leisure to the study of various subjects-especiallynatural science-regardingwhich he was conscious of a knowledge, deficient, or merely empirical.