278 THE ORCHID REVIEW. [SEPTEMBER, 1903- 
course hybrids would not be used as seed parents until they have become 
strong, though the pollen of any promising thing may be tried immediately 
if it should appear healthy, which, however, is not always the case, and 
it is a well known fact that the pollen of certain hybrids is nearly always 
imperfectly developed and impotent, so that one must be prepared for a 
good many failures. 
If two species happen to be in flower which it is thought desirable to 
cross, the strongest-and best established should generally be used as the seed 
parent, but if both are equally strong it is a good plan to make the cross 
both ways, which is very easily affected. Remove the pollen from one 
flower and lay it carefully aside, then take the pollen from the second 
species and apply it carefully to the stigma of the first flower, 
making sure that it is the right place and adheres properly. This being 
done the pollen of the first flower is applied to the stigma of the second. A 
tiny ticket bearing a number should now be attached to the base of the 
pedicel of each flower, and corresponding numbers should be entered in @ 
book giving particulars of each cross, with date and any other particulars 
which it may be desirable to note. Seed-bearing, it must be remembered, 
exerts a considerable strain on the plant, and weak plants may collapse, or 
require a considerable time to recover, so that weak plants and rare or 
chsice varieties should only be used as pollen parents. 
It sometimes happens that two species which it may be desirable to 
cross do not flower quite together, and in some cases it may be possible to 
retard one of them a little without injury, by placing it for some time 
beforehand in a slightly cooler house or position. Not much however can 
be done in this way, but when, as sometimes happens, a flower of some 
choice thing appears out of season, the opportunity of making a promising 
cross which is seldom possible should be taken. And a fact not 
generally known we believe is that pollen may be kept fresh for a time in 
hermetically sealed tubes, and thus be used long after it would have decayed 
if left on the plant. We hope to receive particulars of this method shortly. 
(Lo be continued.) aes 
THE GENUS CAMPYLOCENTRUM. 
A species of Campylocentrum has been described which was not included 
in my notes on the genus at Pp- 245-247. It is as follows :—: 
C. KuNTZEI (Cogn. in O. Kuntze Revis. Gen. Plant., iii., pt. 2, p» 298-)— 
A Bolivian species, collected by M. Otto Kuntze, at Rio Juntas, at 500 metres 
elevation. The affinity is not stated, but it is probably allied to C. micranthum. 
It has elongated, much compressed stems; oblong, obliquely bidentate 
leaves, six to eight cm. long, and racemes rather shorter than the leaves. 
R. A. ROLFE- 
