330 THE ORCHID REVIEW. [ NOVEMBER, 1907. 
whitish lip with some reddish purple markings. The lower photograph gives 
one the impression of a flower with dark sepals and petals, and only © 
an obscure trace of spotting, while the upper shows the colours in something. 
like their true relations. The two might represent distinct varieties. This 
difference is barely perceptible in the lip, because the colours of this organ 
photograph in about their relative degrees of brightness. It is well known 
that such relatively bright colours as yellow, orange and scarlet photograph, 
by the ordinary method, like shades of black, while the relatively darker 
shades of blue and violet come out nearly white, and flowers showing these 
colours should not be photographed by the ordinary method. The effect of 
the isochromatic plate is to increase the luminosity of the shades from yellow 
to scarlet, while the yellow screen cuts off most of the highly actinic violet 
rays, and the two may be used together or separately, according to the 
presence or absence of these colours. Photographs of purple Cattleyas are: 
seldom satisfactory, because they usually come out much too light, while the 
yellow on the disc is more or Jess black, and thus the relative brightness of 
the colours is practically reversed. Again, we have a photograph of the: 
brilliant scarlet Sophronitis grandiflora, but the subject might almost have 
been a black pansy except for some differences in shape. Many otherwise 
interesting photographs have been passed over for this very reason, and the 
point might be borne in mind when flowers that show the colours mentioned. 
are photographed. The photographs reproduced were taken by Mr. F. W. 
Rolfe from a plant in the Kewcollection, and represent the flowers a little: 
below natural size. We believe that it would be possible to select a subject 
in which the colours were actually reversed by the two methods above 
described. 
Epidendrum Wallisii is a very distinct and attractive species, which was 
described by Reichenbach in 1875 (Gard. Chron. 1875, li. P- 66), from. 
materials obtained by Gustav Wallis when collecting for Messrs. James 
Veitch & Sons. Reichenbach referred it to a new section of the genus 
which he called Acropleuranthium, on account of its having both a terminal 
and lateral inflorescence, remarking that only one other species was know? 
namely E. exasperatum, Rchb. f., a native of Costa Rica. E. Wallisii is 4 
native of the Frontino district of Colombia, on the western Cordillera, at 
4,000 to 7,000 feet altitude. Its habit is peculiar, for the axillary raceme 
are produced in succession as the stem gradually elongates, and strong 
established plants flower almost continuously, while the stems ultimately 
reach a height of five feet or more. It is rather variable, in some cases the 
blackish purple spots on the sepals and petals being small and numerous, a 
others fewer and larger, while occasionally they are absent, leaving the sep 
and petals wholly bright yellow. The lipis white, streaked and stained with 
purple, while there are three raised orange lines at the base. E. Wallisit 
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