present. Thus, after a period of nearly seven years, the Collection will again 

 be housed in the same building as the Laboratory. 



Copies of the "Concise Catalogue" of the Collection, which was issued in 

 1953, are still available on request. 



B Loan conditions 



Conditions: 



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

 rowed for one year, after which it must be returned unless a 

 special request for extension of the loan has been made by the inves- 

 tigator, and has been approved by the staff of the Hubrecht Laboratory. 



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

 form of well prepared slides which have been sectioned, 

 stained and embedded properly, clearly labeled (name of species, thick- 

 ness and direction of sectioning, method of staining, etc.) and numb- 

 ered 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 Em- 

 bryological Library of the Hubrecht Laboratory. 



5. If material from 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 of great historical value cannot be sent on loan. 



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 to the person in question. 



VII Photographic Copying Service 



The Hubrecht Laboratory makes photostats on request of papers present in 

 the Central Embryological Library or borrowed from elswhere. The negatives 

 will remain at the Laboratory. 



296 



