116 MR.J. SCOTT ON THE FUNCTIONS AND STRUCTURE OF THE 
Tagıe XII. — Primula farinosa. 
Da al s 50 
558 | 528 | 898 | 922 
sea lass E38 | 585 
Boe | oe o BUS | ne 
A IET E aa a? 
S By 
Form with stamens and pistils of an 
equal length by own pollen ......... 12 5 62 12 
Long-styled homomorphic union...... 14 7 210 30 
Long-styled heteromorphic union ... 8 5 264 52 
Short-styled homomorphic union ...| 14 8 150 19 
Short-styled heteromorphic union ... 8 7 380 56 
SUMMARY. 
The two homomorphic unions......... 28 15 360 24 
The two heteromorphic unions ...... 16 12 644 54 
To the above notice of the pure unions of P. farinosa I will 
now add the results of my experiments on the fertilizing it with 
the pollen of other species; these were chiefly confined to the 
P. Scotica, Sibirica, and involucrata. In my previous notice of 
the latter species, I have shown that the short-styled form of 
P. farinosa is capable of fertilizing the short-styled form of 
P. involucrata, and I also stated that I had utterly failed in 
effecting the converse union of these forms. The latter failures 
are included in the following experiments on four fine umbels of 
the long-styled and three of the short-styled form of P. farinosa. 
I carefully fertilized sixty flowers, one half with the long-styled 
and the other with the short-styled form of P. involucrata, yet, 
though several capsules swelled, they did not contain a single 
good seed! I also tried reciprocal unions between the two forms 
of P. farinosa and the long-styled form of P. Sibirica, but these 
unions,like the preceding, resulted in the complete abortion of 
every seed. With P. farinosa by pollen of P. Scotica I have 
had a little more success: thus, from twelve flowers of short- 
styled P. farinosa fertilized by pollen of P. Scotica I got seven 
capsules; three of these contained no good seed; the other four 
yielded in all 91 seeds, which gives an average of nearly 23 seeds 
per capsule. Now if we refer to the above table of the different 
unions of P. farinosa, we shall see that the fertility of the united 
homomorphie unions is 24 seeds per capsule, so that these pure 
unions only exceed the above hybrid unions of the species in the 
proportion of 100 to 95 ; i. e., for every hundred seeds yielded by 
the pure homomorphie unions of P. farinosa, 95 are yielded by 
