n.--Lamarck on.--multiple origin of.--the nature of
a.--polymorphic.--production by physico-chemical means of.--and
varieties.--de Vries's work on.

Spencer, H., on evolution.--on Lyell's "Principles".--on the nature of
the living cell.--on primitive man.--on the theory of Selection.--on
Sociology.

Spencer, H., on the transmission of acquired characters.--on
Weismann.--various.

Sphingidae, variation in.

Spinoza.

Sports.

Sprengel, C.K.

Stability, principle of.

Stahl.

Standfuss.

Stars, evolution of double.

Stellaria media.

Stephen, L.

Sterility in hybrids.

Sterne, C.

Stockard, his experiments on fish embryos.

STRASBURBER, E., on "The Minute Structure of Cells in relation to
Heredity".

Strongylocentrotus franciscanus.

Strongylocentrotus purpuratus.

Struggle for existence.

Strutt, R.J.

Stuart, A.

Sturdee, F.C.D.

Sutterlin, L.

Sully.

Sutton, A.W.

Sutton, W.S.

Svalof, agricultural station of.

Swainson, W.

Synapta, calcareous bodies in skin of.

S. lappa.

Syrphus.

Tarde, G.

Teleology and adaptation.

Tennant, F.R.

Teratology.

Tetraprothomo.

THISELTON-DYER, SIR WILLIAM, on "Geographical distribution of
Plants".--on Burchell.--on protective resemblance.--elsewhere.

THOMSON, J.A., on "Darwin's Predecessors.--elsewhere.--and P. Geddes.

Thomson, Sir J.J.

Theology, Darwin and.

Tiedemann, F.

Tooke, Horne.

Totemism.

Treschow.

Treviranus.

Trifolium pratense quinquefolium.

Trigonias.

Trilobites, phylogeny of.

Tschermack.

Turgot.

Turner, Sir W.

Twins, artificial production of.

Tylor.

Tyndall, W.

Tyrrell, G.

Uhlenhuth, on blood reactions.

Underhill, E.

Use and disuse.

Vanessa.

Vanessa antiope.

Vanessa levana.

Vanessa polychloros.

Vanessa urticae.

Van 't Hoff.

Varanus Salvator.

Variability, Darwin's attention directed to.--W. Bateson on.--and
cultivation.--causes of.--polymorphic.

Variation, continuous and discontinuous.--Darwin's views as
an evolutionist, and as a systematist, on.--definite and
indefinite.--environment and.--and heredity.--as seen in the
life-history of an organism.--minute.--mutability and.--in relation to
species.--H. de Vries on.

Varigny, H. de.

Varro, on language.

Veronica chamaedrys.

Verworn.

"Vestiges of Creation", Darwin on "The".

Vierkandt.

Vilmorin, L. de.

Virchow, his opposition to Darwin.

Virchow, on the transmissi