visits were paid by Dr. W. P. Luckett (Madison, Wis.) to work in the Central 

 Embryological Collection, and by Miss J. M. Chegwidden (London) to learn 

 embryological techniques. 



Four members of the sixth international team stayed on after July 1968 for 

 varying periods of time. Dr. Adler studies mechanisms of recognition among 

 disaggregated chick embryo neural cells in vitro. Miss Sudarwati investigates 

 inductive interactions during the formation of the marginal zone in the anuran 

 blastula. Dr. Burnside is tracing the incorporation of polysaccharide precursors 

 into the cell surface of slime mold myxamoebae by means of electron microscope 

 autoradiography. Finally Dr. Luckenbill studies ultrastructural aspects of the 

 so-called "surface coat" in early amphibian development. 



Dr. R. W. Glade (Burlington, Vt.) arrived in September for a stay of one 

 year. He has started a cytochemical study of the events associated with grey- 

 crescent formation in the amphibian egg. 



Dr. N. Nikitin (Leningrad), an original applicant to the sixth international 

 team, arrived in October for a stay of six months. He works on aggregation 

 and chemotaxis in the true slime molds {Myxomycetae) . 



Dr. L Slaby (Plzen, Czechoslov.) arrived in October and works on a 

 technique for mass separation of amphibian embryonic cells to be used in bio- 

 chemical studies of early differentiation. 



Dr. M. Klima (Brno, Czechoslov.) worked in the Central Embryological 

 Collection during two weeks in November. 



IV Facilities for international use 



These facilities comprise the Central Embryological Collection, and the 

 Central Embryological Library, with its extensive reprint collection, and its 

 bibliographical service and copying service. Details pertinent to these facilities 

 may be found in the information booklet distributed on a large scale in 1966. 

 This booklet is available on request. A special leaflet describing the Central 

 Embryological Library and its facilities is also available on request. 



