Classified: A, mathematics; B, mechanics; C, physics; D, chemistry; E, astronomy; F, meteorolgy (including terrestrial magnetism); G, mineralogy (including petrology and crystallography); H, geology; J, geography (mathematical and physical); K, pal©Œontology; L, general biology; M, botany; N, zoology; O, human anatomy; P, physical anthropology; Q, physiology (including experimental psychology, pharmacology, and experimental pathology); R, bacteriology. Beginning with the 10th annual issue (covering the literature of 1910) the section QR (serum physiology) is common to the volumes for Q (physiology) and R (bacteriology)

Each class is in one or two volumes, which contain instructions, a schedule of classification and index (in English, French, German and Italian), an author catalogue and a closely classified subject index.

An annual index to current scientific literature, beginning with 1901 (the literature of the 19th century being covered by the Royal society's Catalogue of scientific papers (1800-1900) in 19 volumes, 1914-25, and the Subject index, v.1 ) 1908-

Beginning with the 6th annual issue, covering the literature of 1906, class N, zoology, is merged with the Soological record, v. 43-50 (1906-1914) Issued in two bindings, one uniform with the International catalogue of scientific literature set, one uniform with the Zoological record. Each volume has t.-p. both of the International catalogue of scientific literature and of the Zoological record.