DETERMINATION OF DEFLECTION OF LIGHT BY THE SUN'S GRAVITATIONAL FIELD. 333 



Government, who provided them with transport, accommodation and labour. 

 Dr. MORIZE, Director of the Eio Observatory, acting on behalf of the Brazilian 

 Government, made most complete arrangements for the Expedition, and in this way 

 contributed materially to its success. 



On behalf of the Principe Expedition, special thanks are due to Sr. JERONYMO 

 CARNEIRO, who most hospitably entertained the observers and provided for all their 

 requirements, and to Sr. ATALAYA, whose help and friendship were of the greatest service 

 to the observers in their isolated station. 



We gratefully acknowledge the loan for more than six months of the astrographic 

 object-glass of the Oxford University Observatory. We are also indebted to 

 Mr. BELLAMY for the check plates he obtained in January and February. 



Thanks are due to the Royal Irish Academy for the loan of the 4-inch object-glass 

 and 8-inch coelostat. 



As stated above, the expeditions were arranged by the Joint Permanent Eclipse 

 Committee with funds allocated by the Government Grant Committee. 



[In Plate 1 is given a half-tone reproduction of one of the negatives taken with the 4-inch lens at Sobral. 

 This shows the position of the stars, and, as far as possible in a reproduction of this kind, the character 

 of the images, as there has been no retouching. 



A number of photographic prints have been made and applications for these from astronomers, who 

 wish to assure themselves of the quality of the photographs, will be considered and as far as possible 

 acceded to.] 



