REPRODUCTIVE ORGANS IN THE PRIMULACEE. 113 
P. mollis the average of seeds per capsule is 165. So that the 
decreased fertility of the cross-unions relatively to the pure 
unions of the latter is in the former case as 1 to 98:23, in the 
latter as 1 to 2°46. Respecting the irregular fertilities of the 
converse unions we will simply refer to the fact, by way of further 
supporting our previous remarks on this point, that though the 
short-styled P. cortusoides when used as female with the P. mollis 
is utterly sterile, yet by the converse union of these the highest 
grade of fertility, relatively to any of the other unions given in 
the table, is produced. I may also, in passing, notice that the 
seeds produced upon the long-styled form of P. cortusoides were 
very fine, though the average per capsule is low. Those, on the 
other hand, produced by P. mollis, in its different unions with 
the long- and short-styled forms of P. cortusoides, were so very 
small, that I entertain little hopes of any of them germinating. 
In the following table we have the results of these unions of 
P. cortusoides with P. mollis. 
Dante X.—Hybrid unions of P. cortusoides with P. mollis. 
Ki g mo. Se Ki á = Ei 
?PEUTITaSsil. 41. A 9 
ii 223 |Se2| 222 | 938 
qos 8 9231937 5 $8 
CA d re BLA Dci Mn s 
Ao cu Bee LA VIS M 
Long-styled P. cortusoides 
by pollen of P. mollis ...| 12 7 5 27 5 
Short-styled P. cortusoides 
by pollen of P. mollis ... 12 5 0 0 0 
P. mollis by pollen of long- 
styled P. cortusoides ...... 10 6 4 205 51 
P. mollis by pollen of short- 
styled P. cortusoides...... 10 8 5 336 67 
In the two forms of Primula involucrata the pistil is about 
three times longer in the one form than inthe other. The stigma 
of the long-styled form reaches the mouth of the corolla-tube, 
and the anthers are situated halfway down the tube: in the 
short-styled form the converse of this takes place, namely, the 
style is half the length of the corolla-tube, the anthers reaching 
its mouth. The stigma of the long-styled form is of a globular 
shape, and closely beset with long papille; that of the short- 
styled form is smooth and depressed on the apex: the pollen- 
grains of the latter are also larger and less transparent than those 
