CHAP. VI. PHALAEIS CANARIENSIS. 285 



measurements, and adds the words " very good " to the curves 

 thus formed. 



Shortly afterwards one of the crossed plants in Pot I. died ; 

 another became much diseased and stunted ; and the third never 

 grew to its full height. They seemed to have been all injured, 

 probably by some larva gnawing their roots. Therefore all 

 the plants on both sides of this pot were rejected in the subse- 

 quent measurements. When the plants were fully grown they 

 were again measured to the tips of the highest leaves, and the 

 eleven crossed plants now averaged 68*1, and the eleven self- 

 fertilised plants 62 34 inches in height ; or as 100 to 91. In all 

 four pots a crossed plant flowered before any one of the self-fer- 

 tilised ; but three of the plants did not flower at all. Those that 

 flowered were also measured to the summits of the male flowers : 

 the ten crossed plants averaged 66 '51, and the nine self-fertilised 

 plants 61 59 inches in height ; or as 100 to 93. 



A large number of the same crossed and self-fertilised seeds 

 were sown in the middle of the summer in the open ground in 

 two long rows. Very much fewer of the self-fertilised than of 

 the crossed plants produced flowers ; but those that did flower, 

 flowered almost simultaneously. "When fully grown the ten 

 tallest plants in each row were selected and measured to the 

 tips of their highest leaves, as well as to the summits of their 

 male flowers. The crossed averaged to the tips of their leaves 

 54 inches in height, and the self-fertilised 44 "65, or as 100 

 to 83; and to the summits of their male flowers, 53 '96 and 

 43-45 inches; or as 100 to 80. 



PHALABIS CAKABIENSIB. 



Hildebrand has shown in the paper referred to under the 

 last species, that this hermaphrodite grass is better adapted 

 for cross-fertilisation than for self-fertDisation. Several plants 

 were raised in the greenhouse close together, and their flowers 

 were mutually intercrossed. Pollen from a single plant growing 

 quite separately was collected and placed on the stigmas of the 

 same plant. The seeds thus produced were self-fertilised, for 

 they were fertilised with pollen from the same plant, but it will 

 have been a mere chance whether with pollen from the same 

 flowers. Both lots of seeds, after germinating on sand, were 

 planted in pairs on the opposite sides of four pots, which were 

 kept in the greenhouse. "When the plants were a little over a 



