Fragile a fabric tenuous conjecturas I moored myself in this phrase: ' ' fragile a tenuous fabric of conjecturas' '. A famous English historian in inaugural lesson of the University of London, in 1948 pronounced it. The lesson called Old Economic History, whose sustentation depended on the existence of numerical data. Not, it is clearly, accurately given statisticians in its modern meaning (shunting lines standard, factorial analysis, etc.), but numbers, tables and graphs. Consternado, fulled the master of cautelas and declared with honest erudio to the learning: ' ' they do not exist statistical antigas' ' , adding that, therefore, ambitious projects do not obtain to go beyond ' ' fragile a tenuous fabric of conjecturas' '. If the reader already assimilated ' ' me amarrei' ' in that I open this note, I can add that I soon admired the phrase to the first contact, attracted by its rhythmic fluency, and natural adjustment of this to the content. Therefore I have repeated, it for me exactly, and insinuated vacant in colloquies, as it to pressentir ampler tunes: ' ' fragile a tenuous fabric of conjecturas' '. With the repetition, I was perceiving that the phrase locks up truths that go very beyond the limits of the inaugural lesson of 1948, and of Old Economic History. I gave account of that if it applies with extraordinary justeza to everything what it has been said of the origin of the world, the life and the destination of the man.