Chap. 1. PEIMULA VULGAEIS. 35 



that the two lots together consisted of 83 long-styled 

 and 96 short-styled plants. In the long-styled form 

 the pistil is to that of the short-styled in length, from 

 an average of five measurements, as 100 to 51. The 

 stigma in the long-styled form is conspicuously more 

 globose and much more papillose than in the short- 

 styled, in which latter it is depressed on the summit ; 



Kg, 3. 



Outlines of pollen-grains of Primnla vulgaris, distended with water, much 

 magnified and drawn under the camera lucida. The upper and smaller 

 grains from the long-styled form ; the lower and larger grains from 

 the short-styled. 



it is equally broad in the two forms. In both it stands 

 nearly, but not exactly, on a level with the anthers of 

 the opposite form ; for it was found, from an average 

 of 15 measurements, that the distance between the 

 middle of the stigma and the middle of the anthers 

 in the short-styled form is to that in the long-styled 

 as 100 to 93. The anthers do not differ in size in the 

 two forms. The pollen-grains from the short-styled 



D 2 



