156 



near future. This catalogue will then be sent to all embryological institutes 

 in order to make the collection more easily accessible. 



As a central embryological collection, brought together centrally, where 

 embryologists can find accomodation for studying it, has a much higher value 

 for the Embryological Science than individual small collections, distributed 

 all over the world, we like to interest you in this Central Collection of the 

 International Embryological Institute in Utrecht. 



III. The Normal Table of Xenopus laevis 



In addition to what has been mentioned in the first issue of the G.E.I.S., 

 we can now state that an extensive material of the normal development of 

 Xenopus laevis has been collected in Stellenbosch, South Africa, by Mr 

 J. Faber, assistant at the Hubrecht Laboratory. We want to thank the 

 Directors of the Zoological Institute and the Inland Fisheries Department 

 in Stellenbosch for their lively interest and direct assistance to the scientific 

 work of Mr Faber. 



We have prepared a continuous series of about 70 developmental stages 

 from the very first beginning of development up till the end of metamorphosis. 

 This material has been distributed among the collaborators in order to be 

 investigated in the course of about one year, so that we hope to be able 

 to publish this normal table in the course of the year 1952. 



At the present moment the following embryologists have promised their 

 collaboration to this international team-work: 



Prof. Dr J. Ariens Kappers (Groningen, Holland), Miss Dr J. H. Bijtel 

 (Groningen, Holland), Dr A. Bretscher (Bern, Switzerland), Prof. Dr J. 

 Cordier (Brussels, Belgium), Mr G. A. van Eeden (Potchefstroom, South 

 Africa), Mr J. Faber (Utrecht, Holland), Dr J. C. v. d. Kamer (Utrecht, 

 Holland), Dr J. J. Kollros (Iowa City, U.S.A.), Mrs Dr N. Millard (Cape 

 Town, South Africa), Dr D. R. Newth (London, England), Dr P. D. Nieuw- 

 koop (Utrecht, Holland), Prof. Dr J. Pasteels (Brussels, Belgium), Mr R. 

 van Pletzen (Bloemfontein, South Africa), Prof. Dr Chr. P. Raven (Utrecht, 

 Holland), Mr P. A. J. Rijke (Potchefstroom, South Africa), Dr Shokralla 

 N. Sedra (Alexandria, Egypt), Mr A. L. Smit (Stellenbosch, South Africa), 

 Mr W. Steyn (Bloemfontein, South Africa; now Utrecht, Holland) and 

 Dr S. Toivonen (Helsinki, Finland). 



The subjects which the individual collaborators will study, can be found 

 in chapter b of this issue. 



Communications of the „Institut International d'EmbryoIogie" 



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

 death: Prof. Dr Hans de WINIWARTER, who died July 13th, 1949, at 

 the age of 74 years; and Prof. Dr Eckhard ROTMANN. who died September 

 2nd, 1950, 43 years old. 



Prof. Dr S. R. DETWILER, New York, and Prof. Dr A. T. HERTIG, 

 Boston, resigned their membership. 



The Symposium, which was to be held under the sponsorship of the I. I.E., 

 through the International Union of Biological Sciences, in the summer of 

 1951, has been postponed until 1952. Therefore, the next general assembly 

 of the I. I.E. will be postponed too, in order that it may be combined with this 

 Symposium. 



