CHAPTER I.
NATURE AND THOUGHT The subject-matter of the Tarner lectures is defined by the founder to be 'the Philosophy of the Sciences and the Relations or Want of Relations between the different Departments of Knowledge.' It is fitting at the first lecture of this new foundation to dwell for a few moments on the intentions of the donor as expressed in this definition; and I do so the more willingly as I shall thereby be enabled to introduce the topics to which the present course is to be devoted.
We are justified, I think, in taking the second clause of the definition as in part explanatory of the earlier clause.

What is the philosophy of the sciences?
It is not a bad answer to say that it is the study of the relations between the different departments of knowledge.

Then with admirable solicitude for the freedom of learning there is inserted in the definition after the word 'relations' the phrase 'or want of relations.' A disproof of relations between sciences would in itself constitute a philosophy of the sciences.

But we could not dispense either with the earlier or the later clause.

It is not every relation between sciences which enters into their philosophy.