32 ON THE NUTRITION OF DROSERA ROTUNDIFOLIA 



Additional Memorandum concerning the Nutrition of Drosera 



rotundifolia. By Francis Dakwin, M.B., F.L.S. 



Since the reading of my paper on this subject before the Society, 

 and while it was passing through the press (ante, pp. 17-31), I have 

 become acquainted with an important article on the same subject, 

 of which it behoves me to take notice. I allude to the interesting re- 

 searches of Messrs. Reess, Kellermann, and von Raumer ('Vegeta- 

 tion — versuche an Drosera rotundifolia mit und ohne Fleischfut- 

 terung,' ausgefiihrt von Dr. Ch. Kellermann und Dr. E. von 

 Raumer mitgetheilt von M. Reess. ' Botan. Zeitung,' April 5th, 

 1878), which were originally described before the Phys.-Med. 

 Society of Erlangen, July 9, 1877. The experiments were essen- 

 tially similar to my own, and consisted in the varied and detailed 

 comparison of a large number of fed and unfed plants of Drosera. 

 The food-supply consisted of Aphides instead of meat as in my 

 experiments ; and this, as being more natural, is probably a 

 better method than the one adopted by me. 



The work seems to have been done with great care ; and the re- 

 sults demonstrate in the clearest manner the numerous and 

 striking advantages accruing to the fed plants. — F. D., May 6, 

 1878. 



