416 



It is generally agreed at present that the ectoderm is originally 

 composed of one layer of cells, subsequently a second layer appearing 

 below this primitive one. The manner of production of this second 

 layer has been the subject of some difference of opinion. Gardiner, 

 who investigated the subject carefully in the case of the chick, con- 

 siders that the original cells are divided transversely. I was unable 

 to study this stage in the human embryo, the earliest specimens in 

 good preservation that I could find being from an 8 weeks old foetus 

 that had been cut in serial sections by Dr. Minot. Here the ecto- 

 derm was composed in most places of two layers of cells, an inner 

 cylindrical layer , and an outer layer where te cells were somewhat 

 larger, and had a polygonal and rounded appearance. In places there 

 were apparently three layers, an outer and inner as described, and 

 between these two an intermediate layer, which resembled the lower 

 in the size and shape of the individual cells. 



(Schluß folgt.) 



Anatomisclie Gesellscliaft. 



Dritte Versammlung-, Berlin. 



Außer in dem I. Anatom. Institute (Luisenstraße 56, Tierarznei- 

 schulpark) wird auch in dem IL Anatom. Institute (U. d. Linden, 

 üniversitätsgebäude) Auskunft auf Berlin betreffende Anfragen erteilt. 



Am Abende vor Beginn der Versammlung, Mittwoch, den 9. Oktober, 

 findet gegenseitige Begrüßung und freie gesellige Vereinigung in dem 

 neuen Pschorrbräuhause, Ecke der Friedrichs- und Behrenstraße, statt. 



I. A. 



Der Schriftführer: 

 K. Bardeleben. 



Krommum'ache Bnchdmekerei (Hermum Fohle) In Jens. 



