The impulse to learn drove me to study night and day.

An average Gregorian year is 365.2425 days.

If one takes care to confine classical literary history to its role as an indispensable auxiliary, as prologomenon and restraint, one risks overlooking another history, more difficult to conceive: the history of the meaning of the work itself, of its operation.

It is well illustrated and it is good to see photographs of macrofauna and microflora of the Cambrian rocks of St Tudwal’s Peninsula; thin section photomicrographs, for example the glomeroporphyritic cluster of andesine and augitic clinopyroxene within the Bryn Crin Basaltic Trachyandesite (Plate 18, page 65), are also very welcome.