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This collection of 48 publications is divided into four groups which may be labelled 1. Original papers on the vibrational spectra of aromatic systems. These comprise A1 to A25. 2. Studies of em pirical inter-nuclear potential functions B1-6. 3. Vibrational analyses &s an aid to structural analysis 01-14. 4. Instrum entation and techniques DI-3. 1. As is seen from the distribution of papers amongst the groups, most effort has been devoted to a study of aromatic systems, primarily of fluoro-arom atics. The latter offer special unique and advantageous properties for vibrational studies. The objectives of this work and the extent to which they have so far been realised may be summarised as follows. (i) - the establishing of the pattern of fundamental vibrational frequencies. Much effort has been devoted to showing that the assign ments for the various molecular species are consistent with one another. (a6, as, A9, A1 9, A22 etc.). In this context three extremely useful and general rules have been established (A2, A9, A22). All are strictly applicable only to isotopically related systems but have been shown to be remarkably well upheld when the systems compared differ by non isotopic substitution. The ’Inequality Rule’ was first proposed by the writer and D.H. Whiffen (A2). The second rule, the ’Sum Fule’, is a well established rule for isotopic systems, but has been shown (A9) to be very useful outside of its normal realm of applicability as a consequence of linear gradation of bond properties with isotopic substitution. An adaption of the 'Eedlich-Teller Product Rule’ has also been usefully employed in deciding between alternative proposed assignments (A22).

(I) The System Ferrous Oxide-Phosphoric Acid-Water and some of its Oxidation Products. The existence of the monohydrogen ferrous phosphate Fe(HPO4),H20 (or 2FeO, P2O5, 3H 2O) has "been confirmed. This com-pound was described by Debray but subsequently Erlenmeyer cast doubt on Debray's results. The compound has been obtained in two forms, viz. "amorphous" and crystalline, the latter showing a decidedly lower solubility. In addition a dihydrate Fe(HPO4), 2H2O (or 2FeO, P2O5, 5H2O) has been shown to exist. The dihydrogen phosphate Fe(H2PO4) 2, 2H2O (or FeO, P2O5, 4H2O) described by Erlenmeyer has been confirmed. It is thought that the ferrous phosphates are not complex. By the oxidatiod of phase mixtures poor in acid a red-brown ferric phosphate betaFe 2O3, P2O5, 4H2O is deposited, which is only stable when ferrous iron is present in the liquid phase (at 70°). By completing the oxidation the substance changes both in crystalline form and colour (to pink) to a solid having the same empirical composition. It is thought2that the latter is a complex ferri-phosphate, whilst the former is a true ferric phosphate. (II) An Aeparatus for the Viscosimetric Determination of Transition Points. By means of an apparatus combining the functions of a viscometer and a stirrer the transition points Na2SO4, 10 ↔ OH2O, NiSO4, 7 ↔ 6H2O, and Na2HPO4, 12 ↔ 7H2O have been determined. (III) The System Ferric Oxide-Arsenic Acid-Water at Low Concentrations of Arsenic Acid. The following solid phases have been found to exist between 2·6 and 23·13% of As2O5 in the liquid phase at 25°: Fe2O3, As2O 5, xH2O (where x is probably near 6); Fe 2O3, 2As2O5, 8H2O. The latter compound has not been described before as far as is known. Its existence provides evidence that the ferric arsenates, like the phosphates, are complex. No basic salts were obtained. The system was characterised by an extreme sluggishness in approaching equilibrium.