322 CORRESPONDENCE. ['!,rrnJl.T.reTl*a 



Morris, D.D., Vice-President ; Edwin A. Dalrymple, D.D., Corre- 

 Bponding Secretary; Charles C. Bombaiigh, M.D., Kecording Secre- 

 tary; John W. Lee, Treasurer; P. E. Uhler, Curator; A. Snowden 

 Piggott, M.D., Librarian ; J. B. Uhler, J. De Rosset, M.D., and F. E. 

 Chatard, jun., M.D., Assistant Curators. 



Mr. Carruthers' New Monograph. — Among the new monographs 

 to be issued by the Palasontographical Society is one by Mr. W. 

 Carruthers, on the Fossil Cycadese. We look with interest to the 

 appearance of the work, and we believe that it will demonstrate very 

 effectually the great value of the microscope in palseontological re- 

 searches. 



The Chair of Physiology in Prague. — This chair, which was 

 previously held by the late Professor Purkinje, an Honorary Fellow 

 of the Eoyal Microscopical Society, has been given to Herr Hering, 

 whose splendid researches on the minute structure of the liver our 

 readers are familiar with. 



Irish Diatomacese. — The Eev. E. O'Meara is preparing for the 

 Eoyal Lrish Academy a list of the Irish species. All new species 

 will be figured. Mr. O'Meara has laboured so long and industriously 

 at this department that his work will doubtless be highly prized by 

 microscopista. 



Parasitic Fungi on Cereals. — M. E. Fournier has commenced a 

 series of papers on this subject in the ' Eevue des Cours Scientifiques.' 

 The first is on the Ergot of Eye. 



The Germ Theory. — At the meeting of the Eoyal Irish Academy 

 on the 9th of May, Dr. Stokes read a paper which showed that putre- 

 faction can take place in closed cavities to which air had not been 

 admitted. 



COEEESPONDENCE. 



Mb. Stodder's Difficulty about "Aous." 



To the Editor of tJw ' Monthly Microscopical Journal.* 



KOYAL MiCBOSCOPICAL SOCIETY, KiNG'S COLLEGE, 

 May 14, 1870. 



Dear Sir, — In the last number of the 'Monthly Microscopical 

 Journal,' Mr. Chas. Stodder, in his letter " On the Eesolution of 

 Nobert's Nineteenth Band," says, " I do not know what Mr. Powell calls 

 ' Acus ' (there is no such genus in Pritchard)." The diatom which is 

 sometimes called Navicula acus is described in Pritchard under the 

 name of Amphipleura pellucida, Kiitzing, and must not be confounded 

 with Navictda acua of Ehrenberg, which is Synedra siibtilis, Kiitzing. 



Yours very truly, 



Walter W. Eeeves. 



