470 Meyen's Report for 1839 on Physiological Botany. 



ment of the atoms in the terminal cells, does not agree with 

 previous observations made on this subject, and that a repe- 

 tition of them is therefore necessary. 



M. Morren* has also observed infusoria in the interior of 

 the bags or tubes of Vaucheria clavata ; it was Rotifer vul- 

 garis, and he therefore believes that the animal formations 

 which M. Unger had also seen in this plant, may also have 

 belonged to the same animal. I may here remark, that the 

 appearance of animals in the interior of the Vaucheria was 

 first observed by Vaucher ; they were the Cyclops Lupula, 

 Miill. ; and in 1834 M. Wimmer observed living infusoria in 

 Vaucheria, which, from the short description, appear to have 

 been Radiatae -, even the eggs of this animal were observed. 



How these animals got into the interior of the Vaucheria 

 has not been observed by anyone : indeed M. Morren asserts 

 that his plants were not at all injured ; there were no openings 

 in them through which the animal could enter. M. Morren 

 observed the lively motion of the Rotifer in the interior; he 

 saw how it ran along the sides, pushing the green matter 

 away from it, &c. ; he saw the deposition of eggs and the in- 

 crease of the animals, and it appeared to him that they then 

 descended in the tubes and remained in the new mass, where 

 they cause, like parasitic bodies, those excrescences on the 

 sides of the Vaucheria, just in the same manner as insects 

 produce the gall-nuts. Once M. Morren opened the Vaucheria 

 and let the animal come out, but it tried to return into its 

 old prison. 



M. Wimmerf has continued his observations on the above 

 subject as well as on the development of the spores of Vau- 

 cheria clavata, and will shortly publish his results. 



In the Carlsbad Almanac for the past year there is a 

 paper by M. Corda: — "Observations sur les Euastrees et les 

 Cosmariees." The greater part is full of violent replies to the 

 numerous attacks vrhich Ehrenberg has made on M. Corda 

 in his large work on Infusoria J. M. Corda is much dissatisfied 

 with the manner in which his systematic labours, his accurate 

 observations, and his accurate drawings, as he denominates 

 them, have been treated by M. Ehrenberg ; and he endeavours 



* De I'existence des Infusoires dans les ))lantes. — Bullet, de I'Acad. R. 

 de Bruxelles, VJ. No. 4. Ann. Nat. Hist. vol. vi. p. 344. 



t Jahresbeiiclit der scblesischen Gesellschaft fiir vaterliindische Kultur, 

 1839, p. 123. 



X I must here remark that these Euastreee and CosmariecB are not In- 

 fusoria, as M. Ehrenberg also states, but simple Algce, as I have sufficiently 

 proved in my latest work to all those philosophers who are acquainted with 

 the structure oi Alga;. M. Corda up to the winter of 1833 also held them 

 to be plants. 



