40 



MAINE STATK COLLEGE 



As indicating the range over which tlic study of the subject has 

 extended, a partial list of the species considered by different 

 observers is given. 



Sjyecies in which 

 influence of pollen 

 have been observed : 

 Amaryllis vittata 

 Arabis blepharophylla 

 Cattleya Leopoldi 

 Citrus aurautium 

 Gossypium Barbadense, 

 Lilium bulbiferum 

 Lilium davuricum 

 Matthiola annua 

 Phaseolus vulgaris 

 Pisum sativum 

 Rhododendron dalhousiae 

 Verbena -sp. 

 Zea Mays 



immediate Species in tvhich no immedi- 

 is said to ate effect appears to occur: 

 Cucumis melo 

 Cucuinis sativus 

 Cucurbita maxima 

 Cucurbita moschata 

 Cucurbita pepo 

 Datura Stramonium, 

 Datura inermis 

 Fragaria Virginiana 

 Fuchsia sp. 



Lycopersicum esculentum 

 Mitchella repens 

 Prunus Americana 

 Prinos verticillatus, 



(Ilex verticillata, Gray) 

 Pyrus malus 

 Pyrus Torringo 

 Pyrus Soulardi 

 Vitis labrusca 

 Petunia violacea 

 Phlox Drummondii 

 Sileue armeria 

 Solanum melongena 

 Tropaeolum minus 



The above lists are doubtless incomplete, and in any case they 

 must necessarily be regarded as tentative. In some of the cases 

 cited, however, the evidence seems indisputable. As will be 

 observed, thirteen species belonging to twelve genera in ten 

 distinct natural orders have shown variation supposed to be due to 

 the influence of pollen of the current generation. On the other 

 hand, twenty-two species belooging to fifteen genera in ten natural 

 orders, have failed to show immediate effects. Of the thirteen 

 species showing immediate influence of pollen, four — the orange, 

 the bean, the pea and Indian ccn'n — are of much value as food 

 plants ; while eleven species, or one-half of the whole number con- 

 sidered which have not shown this influence, are also important 

 food plants. These eleven species include many of the leading 

 fruits and vegetables, such as the apple, plum, strawberry, grape, 

 tomato, egg plant, pumpkin, squash and melon. The strongest 



