3202. 
3203. 
3204. 
"3205. 
3206. 
3207. 
3208. 
3209. 
3210. 
3211. 
3212. 
3213. 
3214, 
3215. 
3216. 
3217. 
3218. 
3219. 
3220. 
3221. 
3222, 
3223. 
3224. 
3225. 
FLOWER POLLINATION 349 
Semmola, Vincenzo. Della caprificazione: esperienze e ragionamenti. Rend. 
Acc. sc., Napoli, iv, 1845, pp. 430-1. 
Senebier, J. See under Spallanzani, L. 
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Sergi, G. Ricerche su alcuni organi di sentore nelle antenne delle formiche. 
Riv. filos. scient., Milano, ix, 1891. 
Shaw, Charles H. Inflorescences and flowers of Polygala polygama. Bot. Gaz., 
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The comparative structure of the flowers in Polygala polygama and P. pauciflora, 
with a review of cleistogamy. Trans. Bot. Soc. Pa., Philadelphia, i, 1901, 
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Shaw, Walter Robert. Contributions to the life-history of Sequoia sempervirens. 
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Sherman, Franklin, /r. See under Brimley, C. 8. 
Shibata, Keita. Beitrage zur Kenntniss der Kelch- und Kapsel-Hydathoden. 
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Die Doppelbefruchtung bei Monotropa uniflora Z. Flora, Marburg, xc, 1902, 
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Shimek, B. Perfect flowers of Salix amygdaloides Amzds. Proc. Iowa Acad. Sci., 
Des Moines, iii, 1896, pp. 89-90.—Ab.: Bot. Centralbl., Cassel, xx, 1897, p. 27. 
Shoemaker, D.N. Notes on the development of Hamamelis virginiana Z. Johns 
Hopkins Univ. Cir., Baltimore (Md.), xxi, 1902, pp. 86-7. 
Shufeldt,R.W. The tulip-tree’s flowers. Country Life in America, New York, iv, 
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Shull, George Harrison. A quantitative study of variation in the bracts, rays, 
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and A. prenanthoides 4/z//., from Yellow Springs, Ohio. Amer. Nat., Boston 
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Sickmann, F. Die Hymenopterenfauna von Iburg und seiner nachsten Umge- 
bung. (1) Grabwespen. Jahresber. natw. Ver., Osnabriick, ix, 1893, pp. 39-112. 
Verzeichnis der bei Wellingholthausen aufgefundenen Raubwespen. Op. cit., 
v, 1883, pp. 60-93. 
Nachtrag zu voriger Arbeit. Op. cit., vi, 1885, pp. 175-83. 
Simmons, P. L.. Tropical Agriculture. [Ficus, pp. 478-80.] London, 1889. 
Simon, F. Die Sexualitat und ihre Erscheinungsweisen in der Natur. Jena, 1883. 
Skinner, H. Notes on Buprestidae (Coleoptera) with Descriptions of new species. 
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pp. 236-9. 
Slater, J. W. Flowers and insects. J. Sci., London, Ser. 3, v, 1883, pp. 217-23. 
A question on the relation between insects and flowers. Proc. Ent. Soc., London, 
1886, pp. liii-lv. 
On the functions of the antennae of insects. Zoologist, London, vi, 1848, 
pp. 2175-77. Froriep’s Notizen, Erfurt and Weimar, viii, 1848, col. 6-8. 
On Insects destroyed by Flowers. Proc. Ent. Soc., London, 1879, pp. ix-x. 
A flower attractive to Insects. [The so-called African stone-crop.] Entomologist, 
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Slosson, Annie Trumbull. Hunting Empids. [Rhamphomyia umbilicata visits 
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