Title ofprogram: SUSCEPT2 are converted to susceptibilities, and optionally interpreted in terms of a Curie-Weiss temperature dependence. Catalogue number: ABNA Method of solution Program obtainable from: CPC Program Library, Queen's Susceptibilities x are calculated from the data via their defini-University of Belfast, Northern Ireland (see application tion; ferromagnetic corrections are made using a two-point form in this issue) extrapolation of x(H) vs. 1/H to infinite field; Curie-Weiss interpretation is done on the results of a least-squares fit of Computer: IBM 370/158; Installation: The University of vs. T, where a temperature-independent xo can also be Akron, Akron, Ohio 44325, USA fitted. Operating system: OS/VS2; OS/MVS Restrictions on program complexity The present limit of 100 data points is easily extended. Programming language used: FORTRAN IV (Gi) Typical running time High-speed store required: 10000 words (40 kbt) exclusive of On the IBM 370/158, the program compiles (Gi compiler) loader in about 8 CPU s. A typical case with full interpertation takes less than 3 CPU s. Number of bits in a word: 32 Unusual features of the program Overlay structure: none (1) For each temperature, x values at one or two magnetic fields are found, with uncertainties, corrected for the weight Number of magnetic tapes required: none and magnetism of sample supports. If x is given at two fields, values are averaged or a ferromagnetic correction applied, Other peripherals used: Card reader, line printer as appropriate. A constant xo value, if supplied, is subtracted from all points. Number of cards in combined program and test deck: 747 (2) A calibration mode calculates apparatus constants given a sample of known susceptibility. Constants stay in effect until Card punching code: EBCDIC the next calibration; defaults may be provided.