106 British Uredinee and Ustilaginee. 
and putting into this drop of water the spores whose 
germination it is desired to watch ; as, however, the spores 
do not germinate for several hours, the drop of water would 
evaporate, unless means be taken to prevent it, before the 
germination takes place. This is easily done by placing 
the glass slide under a bell-glass, inverted over a plate of 
water, so that it is kept continuously in a saturated atmo- 
sphere. Any suitable object will do to place the slide on; 
but the most convenient appliance will be found to be a 
simple stand or rack (Fig. 9), which can be constructed 
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Fig. 9.—Stand with slides for the culture of Uredine spores, placed on a plate of water, 
and covered by a bell-glass. 
in a few minutes out of two flat pieces of gutta-percha 
and four glass rods. The gutta-percha which is used 
for soling boots answers well enough. If two oblong 
pieces of equal size, say three and a half by four and a half 
inches (9 X 12 cm.), be taken, and a hole bored at each 
of the four corners, and through each pair of holes let 
a glass rod be passed, a very simple stand is made at the 
cost of a few pence. For the glass rods an old barometer 
tube, cut into suitable lengths with a file, does well enough. 
The great advantage of such a stand is, that when the 
slides are laid across the rods, they touch only at two 
