Chap. IV. LYTHEUM SALICARIA. 151 



posed that I have in any one instance tampered with 

 the results. 



A few words explanatory of the three tables must be 

 given. Each is devoted to one of the three forms, and 

 is divided into six compartments. The two upper ones 

 in each table show the number of good seeds resulting 

 from the application to the stigma of pollen from the 

 two sets of stamens which correspond in length with 

 the pistil of that form, and which are borne by the 

 other two forms. Such unions are of a legitimate 

 nature. The two next lower compartments show the 

 result of the application of pollen from the two sets of 

 stamens, not corresponding in length with the pistil, 

 and which are borne by the other two forms. These 

 unions are illegitimate. The two lowest compartments 

 show the result of the application of each form's own 

 two kinds of pollen from the two sets of stamens be- 

 longing to the same form, and which do not equal the 

 pistil in length. These unions are likewise illegiti- 

 mate. The term own-form pollen here used does not 

 mean pollen from the flower to be fertilised — for this 

 was never used — but from another flower on the same 

 plant, or more commonly from a distinct plant of the 

 same form. The figure (0) means that no capsule was 

 produced, or if a capsule was produced that it contained 

 no good seed. In some part of each row of figures in 

 each compartment, a short horizontal line may be seen ; 

 the unions above this line were made in 1862, and 

 below it in 1863. It is of importance to observe this, 

 as it shows that the same general result was obtained 

 during two successive years ; but more especially be- 

 cause 1863 was a very hot and dry season, and the 

 plants had occasionally to be watered. This did not pre- 

 vent the full complement of seed being produced from 

 the more fertile unions ; but it rendered the less fertile 



