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 PRELIMINARY  NOTICES. 
 VOL.  IL 
 I n  addition  to  those  previously mentioned,  the  following works  are  
 referred  to  in  the present volume. 
 Bail. Mic.  Orff.  Notes  on  Microscopical  Organisms.  By Professor J. W.  
 Bailey  (in Smithsonian Contributions to Knowledge),  Feb. 1854. 
 Bréb. Dial. Cherb.  Note  sur  quelques  Diatomées  Marines  du  Littoral  de  
 Cherbourg, par M.  Alphonse De Brébisson,  1854. 
 Bhr. Microff.  Microgeologie :  von Christian Gottfried Ehrenberg.  Leipzig,  
 1854. 
 Greff. Mic. Journ.  Papers in the Quarterly Journal of Microscopical Science.  
 By William  Gregory,  M.D.,  F.R.S.E.,  Professor  of  Chemistry  in  the  
 University of Edinburgh,  v. d. 
 Greff. Mic.  Trans.  Papers  in  the Transactions of the Microscopical Society  
 of London.  By  Dr.  Gregory,  v. d. 
 Grev.  Ann.  A  paper  in  Annals  of  Natural  History :  by R.  K.  Greville,  
 LL.D., April  1855. 
 Mencff. Dial.  On  the  Animal  Nature  of  Diatomaceæ.  By  Professor  G.  
 Meneghini.  Translated by Christopher  Johnson,  Esq.  (in Ray Society s  
 Publications),  1853. 
 Mic.  Diet.  The  Micrographical  Dictionary.  By  J.  W.  Griffith,  M.D.,  
 F.L.S.  &c.,  and  Arthur  Henfrey,  E.R.S.,  F.L.S.  &c.,  parts  i.  to  xv.  
 18.54-55. 
 Oked. Dial. Bep.  On  deep  Diatomaceous  Deposits.  By Fitzmaurice  Oke-  
 den, C.E.  Quart.  Journ. of Micr,  Science,  1855. 
 Rahen.  Siissw. Biat.  Die  Siisswasser-Diatomaceen :  von Dr. L. Rabenhorst.  
 Leipzig,  1853. 
 Roper, Brit. Biat.  Description of Three new British Species of Diatomaceæ.  
 By F. C.  S.  Roper,  in Quart.  Journ.  of Micr.  Science,  1851. 
 Roper,  Thames Biat.  Observations on the  Diatomaceæ of the Thames.  By 
 F.  C.  S.  Roper,  F.G.S.  Transactions  of  the  Microscopical  Society  of  
 London,  1854. 
 Shad. Nat. Biat.  Descriptions of new forms of Diatomaceæ from Port Natal.  
 By  G.  Shadbolt.  Transactions  of  the Microscopical Society of  London, 
 1854. 
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