The Descent of Man, and Selection in Relation to Sex

by Charles Darwin

Schlegel, Prof., on Tanysiptera.

Schleicher, Prof, on the origin of language.

Schomburgk, Sir R., on the pugnacity of the male musk-duck of Guiana; on the courtship of Rupicola crocea.

Schoolcraft, Mr., on the difficulty of fashioning stone implements.

Schopenhauer, on importance of courtship to mankind.

Schweinfurth, complexion of negroes.

Sciaena aquila.

Sclater, P.L., on modified secondary wing-feathers in the males of Pipra; on elongated feathers in nightjars; on the species of Chasmorhynchus; on the plumage of Pelecanus onocrotalus; on the plantain-eaters; on the sexes and young of Tadorna variegata; on the colours of Lemur macaco; on the stripes in asses.

Scolecida, absence of secondary sexual characters in.

Scolopax frenata, tail feathers of;