155 



c) Every embryologist can personally consult the Library of the Hubrecht 

 Laboratory at all times. 



d) The central library will be at the disposal of every embryologist, who is 

 carrying out scientific work at the Hubrecht Laboratory. 



Since a part of this central collection will be regularly lent out, a single 

 collection cannot fulfil all requirements. For providing information about 

 literature and for the scientific work of the staff of the Hubrecht Laboratory 

 and of visiting embryologists we need a collection which is complete and 

 which is at their disposal at all times. We therefore ask every embryologist 

 to send us two copies of his/her papers, one under the name of the , .Central 

 Embryological Library of the Hubrecht Laboratory" and one under that 

 of Dr P. D. Nieuwkoop, whose collection will form the special collection 

 for internal use. 



In case of private collections, which are not in use any more and which 

 may otherwise get lost, it will be highly appreciated if they could be added 

 to the Central Embryological Library of the Hubrecht Laboratory. 



II. The Central Embryological Collection of slides 

 and material 



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 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 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. 



The central collection will be at the disposal of every embryologist, a s 

 they can study the material at the Hubrecht Labo- 

 ratory, and parts of the collection may be borrowed 

 under special conditions 1 ). 



We hope to compose a general catalogue of the whole collection in the 



X ) Slides. . 



a) if they do not consist of very important and rare material, can be borrowed tor halt 

 a y e a r at the utmost, time for shipment not included. 



b) The receipt, added to the consignment, must be returned by return of postage 

 after being 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. 



Material 

 can be borrowed and studied under the same conditions, but have to be returned as such or 

 in form of slides, which become part of the central collection. 



