Methincyanines -- Methincyanines with substituents on the chain -- Symmetrical trimethincyanines -- Unsymmetrical trimethincyanines -- Trimethincyanines with substituents on the chain -- Symmetrical and unsymmetrical pentamethincyanines, including those with substituents on the chain -- Symmetrical and unsymmetrical heptamethincyanines, including those with substituents on the chain. Polymethincyanines -- Cyanines in which the odd-numbered carbon chain, which links the nuclei, or part of it, is cyclic -- Variations in the nuclei which enter into cyanine molecules -- Bases, including some with substituents on the chain, of which cyanines are the quaternary salts -- Azacyanines, including dyes substituted on the chain, and bases of which the quaternary salts are azacyanines -- Certain classes of dyes related to cyanines -- Merocyanines -- Trinuclear and polynuclear cyanines -- The relationship between colour and constitution in the cyanine series -- Photographic sensitisation and some other properties and uses of cyanine dyes.