OF PASSIFLORA, DISEMMA, AND TACSONIA. 205 
impotent on the stigmas of the T. mollissima, for not even one of 
the ovaries thus treated swelled. 
For faeility of reference, I will here subjoin, in a tabulated 
form, though in a somewhat different order, the more interesting 
results of the foregoing experiments. 
Conelusion.—In the annexed Table we have the results of 37 
distinct unions, in which 294 flowers were experimented upon, 
and the following curious phenomena are exhibited in the func- 
tional correlations of the sexual elements. 
First, from ten unions of Passiflora racemosa—six unions as 
female and four as male—with other species, six fertile con- 
junctions were the result. Of these, one instance alone occurs 
in which the two species reciprocally fertilized each other, viz. 
in the case of P. racemosa and P. c@rulea No. 1. With the 
two other plants of P. cerulea Nos. 1 & 2, P. racemosa treated 
as female yielded nothing, whereas by a converse experiment, 
P. cerulea No. 2 by pollen of P. racemosa, successful conjunc- 
tions were effected (vide Table, line 5). Again, P. racemosa 
may be readily fertilized by pollen of two individuals of the P. 
alata Nos. 1 & 3 (vide Table, lines 8 & 10), yet I failed in 
effecting a converse union by applying pollen of the P. racemosa 
to the P. alata No.1. Similar results were derived from experi- 
ments on the P. racemosa and the Tacsonia mollissima, pollen of the 
latter proving potent on the stigmas of the former, whereas in 
the converse case the pollen of the P. racemosa is utterly ineffec- 
tive on the stigmas of the T. mollissima. Though the P. race: 
mosa will thus simply or reciprocally unite with the above species, 
it will be seen, by looking at line 28 of Table, that it is, never- 
theless, perfectly sterile when treated with its own pollen. It is 
further worthy of remark that, with the exception of T. mollis- 
sima, the other five plants experimented upon likewise proved 
insusceptible of fertilization by their own pollen. 
Secondly, in lines 11 to 14 inclusive of the Table we have the 
results of four unions in each case between three plants of the 
P. c@rulea. These show that the pollen of an individual, A 1, for 
example, will readily fertilize the female element of another indi- 
vidual, A 2, whereas A 2 will not fertilize A1; yet the female 
elements of both A 1 & 2 are susceptible of fertilization by the 
pollen of a third individual, A 3. Again, by consulting lines 
29 & 30 of the Table, we see that the plants here given as A 1 & 2 
cannot be fertilized by their own pollen, and I am told that plant 
A 3 is likewise insusceptible to fertilization by its own pollen. 
Thirdly, we have the complicated results of the pure and mixed 
