REPRODUCTIVE ORGANS IN THE PRIMULACER. 93. 
mula Auricula, Y will, by way of illustrating the above phenomena, 
give the results of several experiments on the hybridization of P. 
Auricula. "These are as follows :— 
TABLE III. — Hybrid unions of Primula Auricula. 
| | ET ER | ' 
| Cy A LS pé 3 ren E no | 
| SE [Es 98. ek 
| ERËEEEIEEAEEEKE 
| EFEIEREIEFIEEEIEBE 
| iB £.8| 5. 213 3 
| Bases he HEHE 
|! Primula Pallinurii, long-styled, by pollen | | 965 
of long-styled P. px dn bean nos j S | s : | a acr: 
| P. Auricula, short-styled, by pollenof short- 1 al z 9 | 165 82 
styled UE. CC Po ai. 
| P. Auricula, long-styled, by pollen of short- ] | g | 4 -|45 168 56 
be hirsuta EE | i. 
| P. Auricula, short-styled, by pollenof short- 8 | 5.194 E m 
| styled P. hirsuta Su x rra | 
| P. Auricula, long-styled, by pollen of the | | 7 | 15 
| non-dimorphie P, verticillata .......... E, si | i | à | = 
For the clear appreciation of the degree of sterility of the union 
of distinct species with the P, Auricula, relatively to the lessened 
fertility of the pure homomorphie unions as compared with the 
pure heteromorphie unions of the latter, I have made the fol- 
lowing comparative tabulation (see Table IV. p. 94) of the results 
given in the Table of the hybrid unions, with those from the 
summary of the different unions of P. Auricula in Table I. :— 
In the second column of the table, the caleulated number of 
seeds is given of the hybrid unions of P. Auricula relatively to 
the hundred seeds produced by the pure heteromorphic unions of 
that species given in the first column. The fourth column con- 
tains a similar estimate of number of seeds by the homomorphie 
unions of P. Aurieula relatively to the hundred by the hybrid 
unions given in the third column. If we compare the results, we 
see that the deereased fertility of the homomorphie unions rela- 
* The scape of Primula Pallinurii met with an injury which prevented the 
perfect maturing of the seeds ; nevertheless, from an examination of a number of 
them, I believe the above is a fair estimate of the good embryonated seeds. I 
may here state, as worthy a passing notice, that while the above long-styled 
plant of P, Pallinurii produced both a large percentage of good capsules and 
seeds when fertilized by pollen of P. Auricula, every capsule aborted of twenty- 
two flowers fertilized by own pollen, though the pollen-tubes freely penetrated 
the stigmatie tissue. We thus see—and the fact is most interesting—that while 
the female element of a long-styled Primula has become impotent to its own 
male element, it is yet susceptible of fertilization by the male element of a dis- 
tinct species, 
12 
