In general, these writers had special qualifications which adapted them for work in their respective fields. To Oak there was a fascination in the study of documents from which the usually uninteresting and sometimes tedious details of events in Spanish and Mexican provincial localities were derived. His contributions to history he could honestly claim were better than other writings on the same subject because of the exhaustiveness of his research through the great amount of material at his disposal. While he admired the finer qualities of style in the writings of others, they were not required in his work. He frankly declared that he had little natural ability in this line, and in the writing of provincial annals found no opportunity for the cultivation of what he had. Oak once asserted in a joking mood that he had found of great service a thorough knowledge of Spanish and French, together with a useful smattering of other languages, including English. None of his chapters were rewritten or even reread with a view to polish, for the reason that he believed his works had their chief value merely as records, and that an attempt to make them fascinating to general readers could but result in impairing their value for reference. The fact that the superintendent of literary activities in the Bancroft library was an enthusiast in original research who cared vastly more what was said than how it was said is a circumstance favoring the accuracy of the histories which must not be overlooked. Oak could say that from the first he had exercised an important influence in the direction of honest research and against superficial work, and that he opposed undue haste in bringing the work to a conclusion. Nemos, unlike Oak, was a writer of smooth, flowing English. On account of his foreign birth he had no preference in the selection of a field, and wrote for more different volumes than any other member of the library force. His great ability, and his consequent position of all-round man, are to be accounted for by great natural endowment supplemented by a thorough training in youth in his own country, a schooling during his London residence in the philosophy of his own country as well as that of the German universities, and a wide acquaintance with European languages. With a remarkable faculty for systematizing work, he was useful, honorable, and trustworthy.