319 
of certain Species of Primula . 
examined, and of these 3*52 % deviated from the normal type. 
The majority of abnormal flowers were heteromerous (53*66%), 
and it was also seen that the short-styled flowers were more 
variable than the long-styled. The androecium proved the 
most aberrant whorl, although the total number of variations 
only showed a percentage of 2-48. The range of numerical 
variation in the different whorls was from 4 to 6. The gynoe- 
cium was always normal. 
It was sometimes noticed that the flowers having parts less 
than five in number were the youngest in an inflorescence, 
which corresponds to what Burkill 1 found to obtain in many 
plants examined by him. 
Primula vulgaris , Huds., 1898 . The blossoms of this 
season were less variable than the cowslips, for out of a total 
of 830, but 2-65 % were aberrant. Of these variations the 
majority (75 %) were heteromerous, and the long-styled flowers 
varied slightly more than the short-styled. The range of 
numerical variation was the same as in P. veris , viz. from 
4 to 6, and the individual parts of numerically anomalous 
whorls of organs were generally above the normal number 5. 
The calyx was the most variable whorl, and, as before, the 
gynoecium was normal throughout. 
1899 . In the spring of this year 2,483 flowers were examined, 
of which number 11-3% were variable; a much higher pro- 
portion than in 1898 . The short-styled blossoms varied more 
than the long-styled by more than 2 %, and it was observed 
that those flowers collected during the height of the flowering 
season were the most abnormal. The majority (57*36%) were 
heteromerous. 
As regards the range of numerical variation, it was found 
in the flowers of this year to be much wider than in those 
examined hitherto, being no less than from 3 to 8 in the 
case of the calyx, 4 to 8 in the corolla, and 4 to 10 in the 
androecium. In the long-styled flowers, taken by themselves, 
this range was not so wide, never being more than from 3 to 7. 
Of the different whorls, the calyx varied more than the 
Loc. cit. 
