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

 Hubrecht Laboratory. 



III The Central Embryological Collection of slides 

 and material 



A Additions 



Prof. Dr S. Toivonen of Helsinki has presented the Collection with the 

 complete set of serial sections of the later stages of Xenopus laevis. used by 

 him during the elaboration of his contribution to the Normal Table of this 

 species. 



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 

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

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

 atory. 



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 and 

 direction of sectioning, method of staining, etc.) and numbered according 

 to given indications. 



3. Costs of transport may be charged if these exceed reasonable limits. 



4. Two copies of those publications dealing with material from the Central 

 Embryological Collection should be sent to the Central Embryological 

 Library of the Hubrecht Laboratory. 



5. If material of the Central Embryological Collection has been used in 

 investigations, it is respectfully requested that this be indicated in the 

 publications concerned. 



Restrictions: 



6. Very rare or regularly consulted material can only be studied at 

 the Hubrecht Laboratory. 



7. Material belonging to the historical collection cannot be lent out. 



8. If material has not been treated properly or (after special request) has 

 not been returned in time by an investigator, material will no longer be 

 lent out to him or her. 



IV The Photographic Reproduction Service 



The Hubrecht Laboratory makes photostats on request of papers present in 

 the Central Embryological Library or borrowed from elsewhere. The negatives 

 will remain at the Laboratory. 



Price list (both text and plates): 



Positive microfilm (24 X 36 mm): p.p. / 0.25 = $ 0.07 



Enlarged prints 



7 X 10 cm (box camera size): p.p. / 0.40 = $ 0.10 

 13 X 18 cm (average page size): p.p. f 0.50 = $ 0.13 

 18 X 24 cm (large page size): p.p. / 0.65 = $ 0.17 



183 



