PUBLICATION'S RECEIVED, XXI 



Poland — 



Univesitiitis Liberte Polouae. 



Spain — 



Real Acadeuiia de Ciencias de Madrid. 

 R-eal Aeademia de Ciencias de Barcelona. 

 Academia de Ciencias de Zaragoza. 



Sweden — 



Geological Institute, Upsala. 



Switzerland — 



Naturforschende Geselischaft, Basle. 

 Naturforschende Geselischaft, Zurich. 

 Soeiete de Physique et d 'Historie Xaturelle, Geneva. 

 International Labor Otfice, Geneva. 



