In this note are coiitaineil the relations 

 and caleiilations of the astronomic, 

 meteoiologieal and geodetic observations 

 which H.K.H. the Duke of the Abruzzi 

 \\as able to carry out on the route from 

 Entebbe to Bujongolo, and during the 

 exploration of the Ruwenzori Range. 



The calculations relating to these 

 observations, as well as the construction 

 and plan of the topographic maps 

 accompanying the present volume were 

 executed at the Hydrographic Institute 

 uf the Royal Navy at Genoa. 



The way liy which the astronomic 

 and meteorological observations were made, from which were olitained the 

 positions and altitudes of the various points indicated on the maps, as well as 

 the methods of calculation employed, are all eml)odied in the accompanying 

 special reports drawn up through the care of the Director of the said Institute, 

 Mattia Giavotto, Captain of frigate, the sections dealing with the meteorology 

 and the astronomic observations lieing prepared by Prof. Omodei and the 

 " Capo-Tecnico " Sig. P. Campigli respectively. 



305 



