1874.] 129 [Johnston. 



amphoric inclusion, but my visit was without other fruit than a sur- 

 prise to the inhabitants, who failed to appreciate any zeal, but who, 

 nevertheless very kindly aided my search. 



About this time my friend Mr. Win, S. Sullivant of Columbus, sent 

 a portion of the Nottingham earth with which I furnished him to Mr. 

 G. Norman of Hull, as I find in a letter of date January 12, 1861, from 

 Dr. J. M. Dempsey, of Charterhouse Square, with this reference : " In 

 the last ' Quarterly Journal of Microscopical Science,' there is a short 

 paper by Mr. Norman of Hull, describing the fossil forms of Diatoma- 

 cese, contained in a deposit forwarded to him by Messrs. Sullivant 

 and Wormley, Columbus, Ohio, described or discovered by you at 

 Nottingham, Maryland." 



The letter also contained a request for some of the earth, with 

 which I complied at once, forwarding by the same conveyance a par- 

 cel to Mr. G. Norman of Hull, and to my almost namesake, the 

 venerable Christopher Johnson, Esq., of Lancaster, and included 

 under the cover of each several other Maryland deposits. For these, 

 Mr. Johnson wrote in acknowledgement a very kind letter, bearing 

 date March 15, 1861, and Mr. Norman's reply soon followed, his 

 letter being dated April 12, 1861. 



From this time until the present, Mr. Tyson and myself have sup- 

 plied quantities of the Nottingham earth to very many correspond- 

 ents; and upon looking over my own slide of the new Bermuda, 

 nothing gives me so much satisfaction as the knowledge that I have, 

 by the very probable discovery of the " Bermuda" locality, contrib- 

 uted so much to the pleasure of other microscopists. 



In reply to a question by the President, Mr. R. C. Green- 

 leaf said that the cliatomaceous forms contained in the 

 Bermuda Tripoli were the same as those found in the Rich- 

 mond earth. 



Dr-T. S. Hunt spoke of the geological age of these de- 

 posits, and said that no infusorial earths are as yet known to 

 occur in Bermuda. 



Prof. W. H. INiles stated that Tyson's Reports on the 

 Geology of Maryland contain very good reports on the va- 

 rious Maryland localities of infusorial earth. 



PROCEEDINGS B. S.K.H. — VOL.. XVII. 9 DECEMBER, 1874. 



