David Starr Jordan 



serration of the margins, in the degree of rough- 

 ness of the surface, in every feature in which one 

 walnut may differ from another. 



Some time since, a hybrid mesembryanthemum 

 was developed, and lasted for four years, forming 

 an attractive plant with a profusion of white 

 flowers. Then all individuals, wherever located, 

 died at once, doubtless because conditions were 

 adverse : but there was no visible cause of soil, of 

 insect pest, of fungus or of climate. These plants 

 all died from the root up. A hybrid of petunia 

 and nicotiana has abundance of flowers and 

 large vigorous leaves, but the roots are inadequate. 

 A hybrid red poppy is formed by uniting the 

 opium poppy with the oriental poppy. These 

 hybrids bloom every day of the year, while the 

 blooming season of either parent is only a few 

 weeks, but they yield no seed. The seed capsules 

 are developed in great variety, some of them four 

 to six times as large as the capsules of either 

 parent. Others are scarcely thicker than the stem 

 which bears them, while others are absolutely and 



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