Hamilton, on striped horses
Smith, Dr., on the Polyzoa
Smith, Mr. Fred., on slave-making ants
--on neuter ants
Snake with tooth for cutting through egg-shell
Somerville, Lord, on selection of sheep
Sorbus, grafts of
Sorex
Spaniel, King Charles' breed
Specialisation of organs
Species, polymorphic
--dominant
--common, variable
--in large genera variable
--groups of, suddenly appearing
--beneath Silurian formations
--successively appearing
--changing simultaneously throughout the world
Spencer, Lord, on increase in size of cattle
Spencer, Mr. Herbert, on the first steps in differentiation
--on the tendency to an equilibrium in all forces
Sphex, parasitic
Spiders, development of
Sports in plants
Sprengel, C.C., on crossing
--on ray-florets
Squalodon
Squirrels, gradations in structure
Staffordshire, heath, changes in
Stag-beetles, fighting
Star fishes, eyes of
--their pedicellariae
Sterility from changed conditions of life
--of hybrids
--laws of
--causes of
--from unfavourable conditions
--not induced through natural selection
St. Helena, productions of
St. Hilaire, Aug., on variability of certain plants
--on classification
St. John, Mr., on habits of cats
Sting of bee
Stocks, aboriginal, of domestic animals
Strata, thickness of, in Britain
Stripes on horses
Structure, degrees of utility of
Struggle for existence
Succession, geological
--of types in same areas
Swallow, one species supplanting another
Swaysland, Mr.
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