152 



of certain authors, for surveys of literature on certain subjects (accor- 

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

 published literature, etc. 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 Holland. 



Conditions. 



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

 Holland 1 month), time for shipment not included. 



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

 return of postage, after having been controlled and 

 signed. 



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

 by the applicant. 



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 who is carrying 

 out scientific work at the Hubrecht Laboratory. 



C. Photographic Reproduction Service. 



The Hubrecht Laboratory intends to provide for photographic reproductions 

 of any papers which are not present in, or cannot be lent out by the C.E.L. 

 The reproductions will be made by the N.LD.E.R. (Dutch Institute for Docu- 

 mentation and Registration) or by the Hubrecht Laboratory itself. They will 

 consist of either positive transparent microfilm prints ( for 

 use in a microfilm reading apparatus) or enlarged ordinary prints. 

 The negatives will remain at the Hubrecht Laboratory. 



In the cases concerned the applicant will receive a form by which he may 

 order a photographic reproduction, to be made at his own expense. The 

 estimated costs of manufacturing and shipment will be mentioned on the form. 



III. The Central Embryological Collection of slides 

 and material. 



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 em- 

 bryologists 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 slides of the late Prof. Dr Anton Dohrn, former Director of 

 the Zoological Station in Napels, a part of the collection of the late Prof. 

 Dr E. Selenka, the experimental-embryological collection of slides 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 slides and 

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

 Hubrecht Laboratory too. 



