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19.
of this kind was [[strikethrough]] had [[/strikethrough]]kept up in 1890-91 with one hundred and sixty-six [[strikethrough]] different [[/strikethrough]] persons, involving over 300 letters and between 600 and 700 pages of writing besides the identification of about 1200 species of mollusks. In 1891-92 the number of correspondents was 114 and the number of pages of writing involved in the correspondence about 820. The number of species identified for various students chiefly by Mr. Simpson under my direction, amounts to considerably over 3000, for each of which a label had to be written.

Special researches [[strikethrough]]The bibliographical appendix[[/strikethrough]] A reference to the Bibliography (Section IV) will [[strikethrough]] indicate the direction of [[/strikethrough]]