PREFACE 



This volume of The New York Society of Electron Micros- 

 copists ' (NYSEM) International Bibliography of Electron Mi- 

 croscopy ( IBEM) contains references to the literature published 

 in the years 1950 through 1955. These were first published 

 on edge-notch cards quarterly as they accumulated. References 

 are also included that were found late and have been issued on 

 the cards through June 1958. Republication in book form is 

 intended to make the references again available now that com- 

 plete sets of the cards have been exhausted and also to facil- 

 itate accessibility to the 4,054 references that occupy more 

 than three linear feet in card form. 



We have used this republication as an opportunity to 

 check all references against the papers in the NYSEM reprint 

 collection for accuracy of transcription and subject analysis-. 

 The whole has been edited for uniformity of style. All known 

 previous errors have been corrected and despite our pains to 

 avoid them, we cannot doubt that some new ones have been cre- 

 ated. We shall be grateful for users bringing these to our 

 attention. 



The greatest problem in compiling the IBEM has been 

 locating pertinent papers that are characteristically numer- 

 ous and widely scattered in the total body of the scientific 

 literature. We were fortunate in the performance of this 

 indispensable task to have been able to enlist the assistance 

 of several libraries. We are pleased to acknowledge the co- 

 operation of Thomas P. Fleming and the staff of the Medical 

 Library of the College of Physicians and Surgeons, Columbia 

 University, New York City; Anna M. Sexton and the staff of 

 the Library of the Division of Laboratories, New York State 

 Department of Health, Albany, New York; Jaqueline Felter and 

 the staff of the Library of the Memorial Center for Cancer and 

 Allied Diseases, New York City, with the collaboration of 

 Frances M. Mottram; and more recently the Library of the Insti- 

 tut ftfr Elektronenmikroskopie, DUsseldorf, F.D.R. We have fre- 

 quently drawn upon the resources of the Libraries of Columbia 

 University and the Library of The Rockefeller Institute, both 

 New York City, in the routine of compiling and editing the 

 IBEM and gladly acknowledge our indebtedness to these insti- 

 tutions. 



Two regional efforts on our Jaehalf to attack the search 

 problem at its source merit appreciative mention. The energy 

 of W. Bernhard, Institute de Recherches sur le Cancer, Ville- 

 juif (Seine) , in bringing the existence and needs of the IBEM 



iii 



