of Edinburgh, Session 1881-82. 
377 
3. The amoeboid movements of the leucocytes may assist in their 
extrusion, but they are certainly not the primary factor in 
the act. Any soft pliable bodies would similarly be extruded 
under the same circumstances. In lipsemia oil globules 
pass through the vessel walls, where there is obstruction, 
in great numbers, and form abscess-like collections of oil 
outside and around it. 
Mr Geddes exhibited living specimens of Convoluta Schultzii, 
his paper (vide infra) being postponed on account of the late- 
ness of the hour. 
Monday, 1 6th January 1882. 
Sir WILLIAM THOMSON, Hon. Vice-President, 
in the Chair. 
The following Communications were read : — 
1. On the Nature and Functions of the “ Yellow Cells” of 
Radiolarians and Coelenterates. By Patrick Geddes. 
It is now nearly forty years since the presence of chlorophyll in 
certain species of Planarians was recognised by Schultze.* Later 
observers recognised that the green colour of certain Infusorians, of 
the common fresh- water hydra (Hydra viridis ), and of the fresh- 
water sponge ( Spongilla. \ fluviatilis), was due to the same pigment, 
but little more attention was paid to the subject until Ray 
Lankester applied the spectroscope to its investigation. He 
thus confirmed the presence of chlorophyll in those animals, 
and extended the list of chlorophyll-containing animals as 
follows : f — 
Infusoria, Stentor Mulleri, &c . ; Foraminifera ; Radiolaria, 
* Beitrage z. Naturgeschichte d. Turbellarien, 1851. 
t Sachs, A Text-Book of Botany (English edition), p. 687, note. 
