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are employed, -a specialist for each science, who, to guard against error, review each reference before publication. It is a matter of congratulation that this country leads in the number of subscribers to the catalogue, the number being 96, equivalent to over 70 complete sets. The individual volumes may be subscribed to for a sum pro rata to the cost of the full set. As the yearly subscription to the full set of seventeen volumes is $85, this is an encouraging showing. Although this cataloguedoi:10.1126/science.18.452.271-d fatcat:iqks3t5gmbfblaghz3owf5qpa4