00 TIIK AMKKICAN MON'rilLV | M.nch, 



Sccrctarv ii";ui ;i translation ol the *• Intnxinilion lo MoIKm's 

 DiattiM) Plates." recently niaiie by President lireckenleUl, and 

 later a paper preparcil hy A. Kilwards. M. I)., ol' Newark. N. )., 

 a corresponding; member of" the society, entitled "Marine I'ossil 

 Dialomacea" iVom California and Their (jeolojjy." 



The pajier stated that the first fossil dialomaceoiis material dis- 

 covered in California was collected in 1S53 by \\'ashin<;t()ii Chil- 

 ton fiom outcro]ipin;4s i>n the shore of Suisnn bay, abont thirty 

 miles from San Francisco. This was sent to Dr. J. R. Chilton. 

 of Ne\y York, who in tnrn placetl it in the hands of Professor 

 J. W. Bailey for examinati<m. It abonnded in nnmerons species 

 of Coscinoi/isci. Arfinorvr/i, Actinoptychi, and other discoid 

 torms. and was in its ijeneral characteristics not unlike the de- 

 posits of Maryland and \'irginia. 



In iSj-j Dr. Edwards took up his residence in Berkeley, and 

 as an assistant to the State Geoloejical Snryey of California he 

 h.ad ample opportunity for collecting and studying the various 

 deposits of diatomaceous or infusorial earths found in this State, 

 many of which have a vvorUl-wide reputation and arc of great 

 scientific interest. The paper gave a detailed description of all 

 the more iK)tablc deposits, and is suj^plemenled by a complete 

 list of all the species identified in fossil marine genera. This is 

 finther enriched by references to authors who have written on or 

 figured these interesting plant skeletons. Dr. I'Idwards places 

 these various deposits in the oligocene, half way between the 

 miocene and eocene. 



After the reading of the papers the society took up the subject 

 of balsam mounting of microscopic preparations, and a general 

 discussion of the various methods adopted by each followed. 

 This proved both interesting and profitable. 



NEW PIHLK ATIONS. 



Lchrbuch der Histologic. By Prof Philipp Stohr. 5th ed. 



Svo. Jena. 

 This revised edition contains many illustrations and the latest 

 results. It ought perhaps to be translated into English. The 

 descriptions are full and clearly written. Especial attention is 

 given to making preparations. 



Medical Microscopy. By Frank J. Wethered. rzmo. Phila- 

 delphia. P. Blakiston, .Son & Co., 1S92. pp. 406, 

 cuts lOI . 

 A book so clear and consise as this, so compict and so essen- 

 tial to the practitioner, ought to sell by the hundred thousand. 

 How a physician of to-day can practice medicine intelligently 

 without such knowledge as this book contains is incredible. 



