The object of this seminar is to develop briefly one simple, unified standard method, capable of dealing, without changing the fundamental attitude, with all cases (classical, quantum, Bose-Einstein, Fermi-Dirac, etc.) and with every new problem that may arise. The interest is focused on the general procedure, and examples are dealt with as illustrations thereof. It is not a first introduction for newcomers to the subject, but rather a 'repetitorium '. The treatment of those topics which are to be found in everyone of a hundred text~ books is severely condensed; on the other hand, vital points vvhich are usually passed over in all but the large monographs (such as Fowler's and Tolman's) are dealt with at greater length.
