INTRODUCTION 



Subscribers are now receiving the seventh full issue, containing the new 

 data received during 1957. The number of individual collaborators and that 

 of collaborating institutes still shows a gradual rise. Contacts have been 

 established with Bulgaria, Hong Kong, Hungaria and Rumania. 



In January, 1958, the General Embryological Information Service will be 

 established as a separate foundation, which will be placed under the control 

 of the Embryological Committee of the Royal Dutch Academy of Sciences. 

 The editorial work and administration will remain in the hands of the staff 

 of the Hubrecht Laboratory. 



The aims of the new foundation falling entirely in line with the general 

 objectives of the International Institute of Embryology, the Board of the foun- 

 dation will gratefully consider suggestions for improvement of this Service 

 from the side of the I. I.E. or of its individual members. 



Following a suggestion of the General Assembly of the International In- 

 stitute of Embryology, in this issue a new chapter is opened, supplying data 

 on new technical methods in developmental biology (see page 194). We have 

 received a satisfactory number of answers on the questionnaire concerned, 

 and expect that this number will increase in following years when the chapter 

 will have shown its usefulness. This chapter will only be published in the full 

 issues, so that each time it covers a period of two years. Suggestions for im- 

 provement will be appreciated. 



As a result of an agreement with the ,, International Committee on Labora- 

 tory Animals" we have decided henceforth to omit from the "Supply and 

 Demand Service [or Laboratory Animals" the information concerning birds 

 and mammals, those groups being covered much more extensively by the pro- 

 gramme of this Committee (see page 199). 



The previous "reviews of recently published books" have been given a sim- 

 pler form, viz. that of announcements, which give just so much factual informa- 

 tion about the books, as will enable the reader to form an idea of their signi- 

 ficance. 



P. D. NIEUWKOOP 



