5 



INTRODUCTION 



General set-up 



This year again very little changes have been made in the set-up. The major 

 change is the renaming of the ..general rubric" III Developmental physiology 

 into: III Physiology o[ development. This was done because it appears that 

 many collaborators do not make a clear distinction between the rubrics II 

 Experimental developmental morphology, and III Developmental physiology. 

 This is caused by the fact that the term ..developmental physiology" denotes a 

 field which historically originates from, and still partly covers the field of 

 ,, experimental developmental morphology". 



In the classification of systematic groups a special heading was added for 

 the Protista. 



The sending-in o[ data 



We ask your attention for the following points: 



1 . We urgently request you to return the forms before 

 August 1st. Data received after November 1st cannot be 

 taken up any more. 



2. A number of collaborators still sends us bibliographical data about their 

 recent pubhcations. May we remind those that we only record 

 current or planned investigations? We hope to provide 

 in the bibliopraphical needs of the embryological world in 

 another way, according to our plans exposed in chapter g of this issue 

 (page 156). 



3. Collaborators working on the same subject are requested to send 

 in separate forms for each of them personally. 



Subscriptions 



The subscription-fee remains H.fl. 22.75 which corresponds to U.S. $ 6. — . 

 We want to bring to your special attention that hence- 

 forward supscriptions are supposed to run until fur- 

 ther notice. 



We can announce that the periodical is financially self-supporting. The num- 

 ber of subscribers is more or less stationery, but it is our conviction that a 

 number of institutes did not yet decide to take out a subscription, although 

 they might profit a great deal by this Service. On request we will send a free 

 copy of a preceding issue to those who are personally interested, or know staff 

 members Ukely to show interest. 



We again ask your collaboration to reach those who are work- 

 ing in a developmental field, but did not yet send in 

 data. Will you please draw their attention to this Service, and send us 

 their addresses? 



General remarks 



This year no data were received from China. The data from South America 

 have augmented considerably. 



We ask your special attention for two new plans: 



1 . The facilitation of exchange and acquisition of labora- 

 tory animals by means of the G.E.I. S. (see chapter /. page 155) 



2. The setting up of an Abstracting Preview Service, which 



