Sondera heterophylla, 284
Sorby, Mr., on colouring matter of Drosera, 5
Spectroscope, its power compared with that of Drosera, 170
Starch, action of, on Drosera, 78, 126
Stein, on Aldrovanda, 321
Strontium, salts of, action on Drosera, 183
Strychnine, salts of, action on Drosera, 199
Sugar, solution of, action of, on Drosera, 78 —, —, inducing aggregation in Drosera, 51
Sulphuric ether, action on Drosera, 219 —, — on Dionaea, 304
Syntonin, its action on Drosera, 102