of Edinburgh, Session 1881-82. 389 
phyll corpuscles of Hydra and Spongilla are quite different from 
algae. 
To the Zoological Station Committee of the British Association, 
especially as represented by its secretary, Mr. Sladen, my best 
thanks are due and tendered, as also to my friends Drs. Andres, 
Eisig, and Mayer. 
Postscript, 21 st April 1881. 
Having concluded this investigation, and having forwarded on 
26tli October last my manuscript containing my results precisely as 
given above [minus only the hypothetic explanation given at p. 386 
of the mode of floating and sinking of Radiolarians, and of the 
concluding paragraph (p. 388) referring to Convoluta , which were 
added when the paper was read] to the medical faculty of the 
University of Edinburgh, as trustees for the quinquennial Ellis 
Physiology Prize, which they have since awarded it, as well as 
notice of the title of the paper to the Secretary of the Royal Society 
of Edinburgh, I naturally paid no further attention to the sub- 
ject. An opportunity for reading of the paper however, unfor- 
tunately, was not afforded me until 16th January last, and it was 
not until after the publication of an abstract in Nature for 26th 
January that I learned, first from a remarkable pseudonymous com- 
munication in The Academy for 29th January, and more satis- 
factorily from a note by Professor Moseley in Nature for 8th 
February, that a new paj:)er by Dr. K. Brandt had appeared in the 
meantime dealing with the same subject.* 
In the succeeding number of Nature (16th February 1882) I 
gave a full summary of Dr. Brandt’s results, which have now been 
very largely republished, and which are as follows : — 
1. His observations are upon the green bodies of Hydra, Spongilla, 
* ( a ) “Ueber das Zusammenleben von Thieren unci Algen,” Verhancll. d. 
Physiol. Gesellsch. zu Berlin, 2 Dec. 1881. 
(b) Sitzungsb. d. Gesellsch. naturforsch. Freundez. Berlin, 15 Nov. 1881. 
(c) “ Die Symbiose niederer Tiere mit Algen,” Der Naturforscher, 14 Jan. 
1881. 
{d) Biologisches Centralblatt, 4 Jan. 1882. 
(e) “ Ueber die Morpbologische und physiologische Bedeutung des Chloro- 
phylls bei Thieren,” Archiv. f. Anat. u. Physiol., Physiol. Abtheih, April 1882. 
