far less inconvenient to call them 13 B and 13 C than to abandon the old numbers.
Min. I give up the objection.
Euc. You will allow then, I think, that my sequence and system of numbers should not be abandoned without good cause?
Min. Oh, certainly. And the onus probandi lies clearly on your Modern Rivals, and not on you.
Euc. Unless, then, it should appear that one of my Modern Rivals, whose logical sequence is incompatible with mine, is so decidedly better in his treatment of really important topics, as to make it worth while to suffer all the inconvenience of a change of numbers, you would not recognise his demand to supersede my Manual?
Min. On that point let me again quote Mr. Wilson. In his Preface, p. 15, he says, 'In a few years I hope that our leading mathematicians will have published, perhaps in concert, one or more text-books of Geometry, not inferior, to say the least, to those of France, and that they will supersede Euclid by the sheer force of superior merit.'
Euc. And I should be quite content to be so superseded. 'A fair field and no favour' is all I ask.
§ 2. Method of procedure in examining Modern Rivals.
Min. You wish me then to compare your book with those of your Modern Rivals?
Euc. Yes. But, in doing this, I must beg you to bear
