5 



INTRODUCTION 



As mentioned in the introduction to the previous issue, the General Em- 

 bryological Information Service has now gained its definitive form. Therefore 

 this year only minor changes have been made in the set-up, mainly in order 

 to obtain a still greater uniformity. 



The list of names and addresses. 



If possible, names of animals and groups have been removed from the texts 

 of the subjects, and are given in Latin at the end of the text. As a rule names 

 of larger systematic units (e.g. class) have been omitted and the names of 

 smaller units (e.g. order, sub-order, if known) given instead. All names, except 

 those of genus and species, have been put between parentheses. 



We have removed from the list a small number of subjects, which, as far 

 as could be concluded from the text, did not have any apparent connection 

 with embryology or development. 



In the case of two collaborators, of whom only one has sent in a form, we 

 have usually listed the other one too, with the same address and subject. 



The list of institutes. 



We have usually removed from the scientific staffs the names of those 

 investigators who never sent in any data, except in the case of directors, 

 correspondents or heads of departments. Institutes which, as a whole, never 

 sent in any data, have usually been altogether removed. 



England, Scotland and Wales have been hsted as one country, under the 

 heading United Kingdom. 



The list of subjects. 



Some minor changes and additions have been made in the rubrics and sub- 

 divisions, for reasons of clearness. 



The sending - in of data for the 1952 - issue. 



The new forms will be sent to you during February 1952 together with 

 a circular. It is very important that this circular is read 

 thoroughly, because it helps you to fill in the forms properly, which 

 saves us a considerable amount of time. Moreover it appeares necessary to 

 stress once more our request to return the forms before August. 

 This year again a large number of forms arrived only during September and 

 October, which caused a considerable hindrance in the preparation of this issue. 



Finally we would appreciate it very much if you could redact the general 

 characterisation of your subject(s) in such a way, that it is at once 

 apparent to which (one or more) of the seven general 

 rubrics (vid. page ...) your subject (s) belong (s). This will 

 save a considerable amount of work in classifying the subjects. 



Subscriptions. 



The subscription-fee remains 22,75 florins (Dutch currency), which at 

 present corresponds to about $ 6. — . 



We very urgently ask those subscribers who get or order the 

 G.E.I. S. through the agency of a bookseller, to communicate to us 

 the name of the firm concerned, since most booksellers do not 

 mention the name of the subscriber in their transactions. 



