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A. The Collection. 



The extensive embryological material, collected by Prof. Dr A. A. W. 

 Hubrecht during his life, is present at the Hubrecht Laboratory in the form 

 of an enormous number of slides and an extensive material kept in alcohol. 

 This collection, containing complete embryological material of many very 

 interesting and rare animals, is in a very good condition. 



Dr D. de Lange, Director of the Hubrecht Laboratory from 1916 up till 1947, 

 has extended this material in several aspects, while a number of embryologists 

 have donated their private collections to the central collection of the Hubrecht 

 Laboratory. 



At the present moment the Hubrecht Laboratory possesses the complete 

 collections of shdes of the late Prof. Dr Anton Dohrn, former Director of the 

 Zoological Station in Naples, a part of the collection of the late Prof. Dr E. 

 Selenka, the experimental-embryological collection of shdes of the late prof. 

 Dr H. Spemann, etc., while recently Prof. Dr F, Hochstetter from Vienna 

 promised to leave his very important and extensive collection of shdes and 

 material to the ,,Institut International d'Embryologie" to be placed in the 

 Hubrecht Laboratory too. 



The central collection will be at the disposal of all embryologists, as they 

 can study the material at the Hubrecht Laboratory, 

 and parts of the collection may be borrowed under 

 special conditions (see section B). 



Besides a very detailed card-index we are composing a more general cata- 

 logue of the whole collection, which will in due course be sent to all embryolo- 

 gical institutes, in order to make the collection more easily accessible. 



We like to draw your attention to the very great advantages 

 of a Central Embryological Collection, with accomodation 

 for embryologists to study it. Such a collection has a much higher value than 

 individual small collections, distributed all over the world. We therefore would 

 hke to ask from you all possible help and collaboration in increasing the value 

 of our Collection. 



B. Conditions [or borrowing. 



1. Slides 



a. If they do not consist of very important and rare material, may 

 be borrowed for 1 year at the utmost, time for shipment not 

 included. 



b. The receipt, added the consignment, must be returned b y 

 return of post, after having been controlled and signed. 



c. The slides have to be packed safely on returning. 



d. In case of high forwarding-charges they have to be partly carried 

 by the applicant. 



2. Material 



may be borrowed and studied under the same conditions, but has to be 

 returned as such or in the form of shdes, which become part of the 

 central collection 



IV. The Photographic Reproduction Service. 



The Hubrecht Laboratory is willing to make photographic reproductions of 

 any papers which are present in the C.E.L. or can be borrowed from elsewhere. 

 These reproductions will be either positive transparent 



