FLOWER POLLINATION 307 
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2234. On Objections to Darwin’s Theory of Fertilization through Insect Agency. 
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2235. On two classes of Male Flowers in Castanea. Op. cit., xix, 1870, pp. 282-3. 
2236. On the Flowers of Aralia spinosa Z.and Hedera Helix Z. Proc. Acad. Nat. 
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2239. On Hermaphroditism in Rhus cotinus and in Rhus glabra. Proc. Amer. Ass. 
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2241. Flowers of Viola and Impatiens. Op. cit., 1873, p. IOI. 
2242  Cleistogamous Flowers in Viola striata. Amer. Nat., Boston (Mass.), vii, 1873, 
p- 563. | 
2243. Fertilization of Pedicularis Canadensis. Proc. Acad. Nat. Sci., Philadelphia (Pa.), 
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2245. Dimorphous Flowers in Passiflora. Proc. Acad. Nat. Sci., Philadelphia (Pa.), 
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2246. Fertilization of Gentiana. Op. cit., 1874, p. 160. 
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