Sparta, [129], [130], [136], [203]
Spartacus, [191], [192], [203], [430]
Spartans, [136]
Species, generation of, [17]; new, [36]
Speech, primitive human, [63]
Spiders, [23]
Spiral nebulæ, [5]
Spores, [24]
Stagira, [142]
Stamford Bridge, battle of, [286]