162 



donated to the Central Embryclogical Collection of slides and material of the 



Hubrecht Laboratory. 



B Services rendered by the C.E.L.: conditions [or borrowing 



1. Every embryologist can ask for information about literature 

 of certain authors, for surveys of literature on certain subjects (according 

 to the classification-system of the G.E.I.S.), for surveys of newly 

 published literature, etc. 



2. Every embryologist can borrow reprints which are not available 

 in his own country. Books and Normal tables are usually not lent out, 

 volumes of periodicals are only lent out to investigators in the Nether- 

 lands. 



Conditions: 



a. Reprints may be borrowed for 3 months at the utmost (for 

 the Netherlands 1 month), time for shipment not included. 



b. The receipt added to the consignment must be returned by return 

 of post, after having been controlled and signed.. 



c. In case of high forwarding charges these have to be partly carried 

 by the appHcant. 



3. Every embryologist can personally consult the C.E.L. at all 

 times. 



4. The C.E.L. will be at the disposal of every embryologist working at 

 the Hubrecht Laboratory. 



Ill The Central Embryological Collection of slides 

 and material 



A The Collection; Concise Catalogue; etc. 



In the course of the last three years the collection has been entirely re- 

 organized. The material has been arranged systematically and as much as 

 possible according to the stageings of existing Normal Tables. 



In the beginning of 1954 a Concise Catalogue of the collection will be 

 published and distributed among all embryological institutes. This publication 

 contains also a bibliography of Normal Tables and similar publications. 



We trust that the accessability of the collection has improved very much 

 by the reorganization and will still be improved by the establishment of a 

 detailed card index to be completed in the course of 1954. Until now few 

 workers were aware of the extensive and often extremely rare embryological 

 material which the collection contains. 



B Conditions [or borrowing 



Conditions: 



1. Slides, material in paraffin and/or material in alcohol can only be bor- 

 rowed for one year, after which it has to be returned automatically 

 in case no special request for extension of the loan has been made by 

 the investigator and has been approved by the staff of the Hubrecht 

 Laboratory. 



2. Material in alcohol or paraffin has to be returned as such or in the form 

 of well prepared slides which have been sectioned, stained 

 and embedded properly, clearly labeled (name of species, thickness 



