234 



ZEA MAYS. 



Gut. VI. 



also anernophilous, or is fertilised by the wind ; and of such plants 

 only the common heet had been tried. Some plants were raised 

 in the greenhouse, and were crossed with pollen taken from a 

 distinct plant ; and a single plant, growing quite separately in a 

 different part of the house, was allowed to fertilise itself spon- 

 taneously. The seeds thus obtained were placed on danp sand, 

 and as they germinated in pairs of equal age were planted on 

 the opposite sides of four very large pots ; nevertheless they 

 were considerably crowded. The pots were kept in the hothouse. 

 The plants were first measured to the tips of their leaves when 

 only between 1 and 2 feet in height, as shown in the following 

 table : 



Table XCVIL 

 Zea mays. 



The fifteen crossed plants here average 20*19, and the fifteen 

 self-fertilised plants 17*57 inches in height; or as 100 to 87. 

 Mr. Galton made a graphical representation, in accordance with 

 the method described in the introductory chapter, of the above 



male flowers usually shed their K. Akad.' 

 polleu before the female flowers p. 743. 

 are mature: ' Mouatsbericht der 



Berlin, Oct. 1S72, 



