472 APPENDIX II. 



Rue. See Ruta graveolens. 



Russula rubra, 333. Fresh, or in alcohol. (As substitute, gee Agaricus 



campestris.) 



Rust-fungus. See Puccinia graminis. 

 Ruta graveolens (Common Rue). Structure of leaf, 189 et seq. Leaves. 



Fresh. Obtainable all the year round. A hardy sub-evergreen. 



S. 



Saccharomyces Cerevisice (Yeast), 288. Can be grown in Pasteur's fluid. 



Saccharum officinarum (Sugar-cane). For wax, 99. Stem. Frequently 

 grown in hot-houses. 



Salisburia adiantifolia. See Ginkgo biloba. A hardy deciduous tree. 



Sambucus nigra (Elder). Cork, 182. Twigs of various ages. Fresh, and in 

 alcohol. 



Saxifraga crustata. For deposit of carbonate of lime on leaf, 64 (footnote). 

 Fresh leaves. Common garden species of rock plant. 



Scolopendrium vulgare (Hart's-tongue Fern). Structure of leaf, and spor- 

 angia, 354. Fertile leaves. Alcohol. 



Scorzonera hispanica (Salsify). Latex system, 125. Roots. Fresh, and in 

 alcohol. A hardy kitchen -garden herbaceous plant. 



Scotch Fir. See Pinus sylvestris. 



Selaginella Martensii. Structure and spore-production, 365. Fertile shoots. 

 Dry, or in alcohol. This, or some similar species is universally 

 cultivated in plant-houses. 



Sliepherdia canadensis. Scale-hairs, 93. Leaves. Fresh, or in alcohol. 

 Hardy deciduous shrub. 



Shepherd's Purse. See Capsella Bursa-pastoris. 



Siphonece. See Vaucheria. 



Solanum tuberosum (Potato). For structure of Starch, 10. Used for 

 production of pathogenic cork, 187-8. For cultivation of bacteria, 

 266. In each case use fresh tubers. See also Phytophthora. 



Sphagnum acutifolium (Bog-moss). Structure, 231. Plants. Fresh. Very 

 commonly used in plant-houses. 



Spindle-tree. See Euonymus. 



Spirochcete plicatilis, 276. Water containing decaying algae, especially 

 Spirogyra and Vaucheria. 



Spirogyra. Structure, 252. Living plants. 



Conjugation, 291. Living plants. Summer. Plants in this state 

 are recognisable by the crinkled yellowish look, and clinging to- 

 gether of the masses of threads. For the culture of Spirogyra, see 

 * p. 251. 



Staphylea. Formation of pollen-tube, 392. Flowers. Fresh. Grown in 

 5 per cent, solution of sugar, and 1*5 per cent, gelatine. 



Stinging Nettle. See Urtica dioica. 



Stock, Ten-week. See Matthiola annua. 



