nd, H., letters to.
-on zoological nomenclature.

Stripes, loss and significance of.

Structural dissimilarity, and sterility.

Structure, external conditions in relation to.

Struggle for existence.
-and crossing.
-factors concerned in.
-and hybrids.
-J. Scott on.

Strychnos, F. Muller on.

Student, Darwin as an Edinburgh.

Studer, Bernhard: Several of Studer's papers were translated and published
in the "Edinburgh New Phil. Journ." See Volume XLII., 1847; Volume XLIV.,
1848, etc.
-on cleavage and foliation.

"Studien zur Descendenz-Theorie," Weismann's.

"Studies in the Theory of Descent," Meldola's translation of Weismann's
book.

"Study of Sociology," H. Spencer's.

Stur, Dionys (1827-93): Director of the Austrian Geological Survey from
1885 to 1892; author of many important memoirs on palaeobotanical subjects.

Style, Darwin on.
-Darwin on Huxley's.
-effect of controversy on.

Suaeda, bloom on.

Submergence.

Subsidence, evidence of.
-coral reefs and.
-and elevation.
-equable nature of.
-large areas simultaneously affected by.
-in oceans.
-and sedimentation.
-volcanic action.

Subterranean animal, existence in Patagonia of supposed.

Subularia, fertilisation of.

Succession of types.

Sudden appearance of organisms, due to absence of fossils in pre-
Cambrian rocks.

Sudden jumps, modification by.
-Darwin's disbelief in.

Suess, "Antlitz der Erde."

Suffolk Crag, comparison with recent strata.

Sugar-cane, Barber on hybrids of.
-new varieties of.

Sulivan, Admiral, on Patagonia.

Superficial deposits, geological nature of.

Supernumerary members.
-amputation followed by regeneration of.

"Survival of the fittest," Darwin on use of the expression.
-Wallace on the expression.
-sharpness of thorns the result of.
-colour of birds and.

Swainson, on wide range of genera.

Switzerland, Tyndall on valleys of.

Sydney.

Symonds, William Samuel (1818-87): a member of an old West-country
family, was an undergraduate of Christ's College, Cambridge, and in 1845
became Rector of Pendock, Worcestershire. He published in 1858 a book
entitled "Stones of the Valley;" in 1859 "Old Bones, or Notes for Young
Naturalists;" and in 1872 his best-known work, "Records of the Rocks."
Mr. Symonds passed the later years of his life at Sunningdale, the house
of his son-in-law, Sir Joseph Hooker. (See "Quart. Journ. Geol. So