Original (inglés)

PREFACE The writing of historical biography is properly a work of partnership, to which public credit is awarded too often in an inverse proportion to the labours expended. One group of historians, labouring in the obscurest depths, dig and prepare the ground, searching and sifting the documentary soil with infinite labour and over an area immensely wide. They are followed by those scholars and specialists in history who give their lives to the study of a single period, and who sow li