human
With regard to the second part of this subject--_i.e._ the proportions of the several parts of the index--I may observe that the most useful mode of division appears to me to be that which is adopted by many offices--namely, to classify the surname under its first letter, and to subdivide according to the first vowel thereafter, adopting the first subdivision for such names as 'Ash,' 'Epps,' etc., which have no succeeding vowel.