155 



microfilm prints (for use in a microfilm reading apparatus) o r 

 enlarged ordinary prints. The negatives will remain at the 

 Hubrecht Laboratory. 



Definitive prices could not yet be fixed, but the costs will certainly not exceed 

 j^ 0.50 (=$0.15) per page, as long as there occurs no substantial change in 

 the present costs of photographic materials. 



Apphcants wil receive an order from to be filled in, 



V. The Normal Table of Xenopus laevis. 



An extensive bibhography has been composed, comprising the anatomy and 

 development of the Pipidae, and the development of Anura in general. Each 

 collaborator has received the section pertaining to his/her subject. 



Four contributions have been received, and several others make satisfactory 

 progress. 



Prof. S. Toivonen (Helsinki, Finland) has undertaken the description of the 

 entire development of mouth and pharyngeal cavity (including thyroid gland, 

 thymus, lungs). 



Dr R. Cambar and Mr R. Williaume (Talence, France), will study the 

 development of the nephroic system up till metamorphosis. 



Prof. E Vannini (Modena, Italy) will examine the development of the 

 gonads up till metamorphosis. 



Dr B. I. Balinsky (Johannesburg, South Africa) has taken over one of the 

 subjects of Mr J. Faber (Utrecht, Holland): intestinal tract and glands. 



Facilitation of excliange anJ acquisition of 

 laboratory animals 



From several sides we have been asked whether the Hubrecht Laboratory 

 could play and intermediary role in the exchange and acquisition of laboratory 

 animals. 



It will be evident that the role of the Hubrecht Laboratory has to be restricted 

 to the mere providing of addresses either of trade organisations, or of institutes 

 which want to enlarge their stock of animals on exchange basis. The latter task 

 can be easily combined v/ith the activities of the General Embryological Infor- 

 mation Service. 



Consequently we will, in the first place, take up contacts with trade organi- 

 sations all over the world. In the second place, to every institute which collabo- 

 rates with the G.E.I.S. we will send, together with the usual forms, a form 

 meant to record data on species of laboratory animals available, species wanted, 

 and conditions. 



The results will be published in a separate chapter of the G.E.I.S., to start 

 with the 1953-issue. The resulting transactions should then be carried out 

 directly between the interested parties. 



If there are any suggestions to improve these plans, we shall be only too glad 

 to receive them. 



Communications of tlie „Institut International J'EmLryoIogie** 

 (Embryological Section of tlie l.U.B.S.) 



The I. I.E. has to announce with regret the loss of three of its members 



