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Rh united academies, and long successions of learned compilers. I cannot hope, in the warmest moments, to preserve so much caution through so long a work, as not often to sink into negligence, or to obtain so much knowledge of all its parts as not frequently to fail by ignorance. I expect that sometimes the desire of accuracy will urge me to superfluities, and sometimes the fear of prolixity betray me to omissions: that in the extent of such variety, I shall be often bewildered; and in the mazes of such intricacy, be frequently entangled; that in one part refinement will be subtilized beyond exactness, and evidence dilated in another beyond perspicuity. Yet I do not despair of approbation from those who, knowing the uncertainty of conjecture, the scantiness of knowledge, the fallibility of memory, and the unsteadiness of attention, can compare the causes of error with the means of avoiding it, and the extent of art with the capacity of man; and whatever be the event of my endeavours, I shall not easily regret an attempt which has procured me the honour of appearing thus publicly,

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