Plate 6 





:kV 



N 



.'^M 



's 



--.yi'-^ 



^;\r . -"; " i^ci.-""^. "-y^ 



Typical Views of Magnetic Expeditions in Europe and Africa. 



I. Near Observatory, Cape Town. 

 2. Valetta. Malta. 3. Near Fort Motylinski, Algerian Sahara. 



4. Comparison stations at Terracina, Italy. 3. Tripoli, Tripoli. 



