200 MR. 8. LE M. MOORE’S STUDIES 
the parts in some Neottiew. In Diuris, for example, the anther 
is almost invisible from in front, on account of the large rostellum, 
\ and the anther remaining permanently attached slits longitu- 
dinally. But the pollinia in this case lie vertically, that is parallel 
with the axis of the column, so that their upper ends touch the 
viscid part of the rostellum and are thus provided with a gland. 
In Orestia, on the other hand, the pollinia are quite free from the 
rostellum, which appears absolutely functionless except as a means 
of preventing the pollinia falling on tothe stigma. It is obvious, 
however, that to none of the other sections of Orchidew can it 
be referred, for the form of the pollinia aud absence of caudicles 
precludes Ophrydes» ; while Epidendres and Vandes have oper- 
eular anthers. 
DESCRIPTION OF PLATE VI. 
Fig. 1. Orestia elegans, n. sp. The entire plant. Natural size. 
2. The flower, enlarged. 
3. The column from in front. r, rostellum ; a, anther ; s, stigma. 
4. The column from behind. r, rostellum ; a, anther; p, pollinia. 
5. Diagram of the course of the bundles. r, rostellum. a*, fibrovascular 
bundle to anther ; s*, lateral bundles of column. 
6. Pollen-mass. 
upon Pjotoplasmic Movement, Part I. By SPENCER LE 
M. Moónz, F.L.S. 
[Read 2nd June, 1887.) 
(Piare VII.) 
IN the year 1856 Bóhm* put on record the discovery that 
chlorophyll grains alter their position, collecting into masses in 
sunlight and moving on to the side-walls of the cells—the latter 
movement being effected also, but more slowly, in darkness. This 
matter he investigated on a rather large scale, no less than 
upwards of a hundred species of Crassulacee being used in the 
course of the experiment. Three years later Bóhm f returned 
to this subject, but beyond noticing that the Sazifragec resemble 
their allies, the second memoir contains little of present interest. 
* Bitzb. der Wien. Akad, 1856, Band xxii. Heft 2. 
t Ibid, 1859, Band xxvii, Heft 2. 
STUDIES "Eton Brotoey.—III. The Influence of Light 
