Changes of address 



For our plan to make the following full issues, starting with the 1955-issue, 

 as complete as possible, we need your personal cooperation. The possibility 

 that addresses get out of date and the news of the foundation of new institu- 

 tions will not reach us. increases with biennial collecting of data. We therefore 

 urgently request all our collaborators to send us additional informa- 

 tion about changes of address and new institutions, 

 so that we can include them in our administration and collect the accurate data 

 for the 1955-issue in the first half of 1955. We will also try to extend our in- 

 formation concerning the medical and veterinary institutes in which embryolo- 

 gical work is regularly or occasionally being done. We hope to add also more 

 information from the Latin-American countries, the Arab countries, Southern 

 Asia etc. 



May we thank you in advance for your cooperation. Please return the 

 attached card at your earliest convenience. 



Subscription fee 



We have amply considered the possibility to offer this supplement without 

 further charges to our regular subscribers. Although we are able to include the 

 supplement 1954 in the subscription for 1953, we are not sure that we can do 

 this in future for further supplements without a slight increase of the subscrip- 

 tion fee for the full issues. Costs of printing, paper, shipment etc. are still 

 increasing. Since the G.E.I.S. is self-supporting we shall consider this point 

 every second year in order to guarantee a sound financial base. 



P. D. NIEUWKOOP 



