Ch. in. SOUTH AMERICA. 235 



tacked meat Chichichoco, and increafing at Muliiii:il, 

 I was obliged to remain in a cow-houfe on that moun- 

 tain, from whence I was removed to Riobamba ; and 

 this accident hindered me from being prefent at the 

 fignals XV. XVI. and XVII. which were thofe of 

 Guayama, Limal, and Nabufo. 



XVIII. Signal of Sifa-pongo. 



At the fignal of Sifa-pongo, we continued from the 

 9th to the end of November ; and here the trigono- 

 metrical obfervations were intermitted, till Don George 

 Juan and M. Godin returned from Quito, to which 

 city they repaired in order to take fome meafures ne- 

 ceffary for the continuation of the work. But, that 

 this interval might not be lofb, M. Bouguer pro- 

 pofed to make fome experiments, in order to demon- 

 llrate the fyilem of attradion. The place he made 

 choice of for thefe experiments was the mountain of 

 Chimbarazo. In this ftation, and the following of the 

 fandy defert of the fame mountain, we fuffered more 

 than on any other. 



XIX. Signal of Lalangufo. ' 



On the defert of Lalangufo, our obfervations were 

 continued from the 24th to the 31ft of January 1739. 



XX. Signal on the defert of Chufay. 



The ilation on the defert of Chufay was one of the 

 moil tedious in the whole feries of triangles, being un- 

 avoidably detained on this difagreeable mountain from 

 the 3d of February to the 24th of March. This de- 

 lay was occafioned by the difficulty of pitching on pro- 

 per places for ere6ling the fucceeding fignals, that they 

 might iland m full view, be eafily difinguiflied one 

 from another, and form regular triangles. This was 

 indeed a difficult tafl<, the lofty fummits of the moun- 

 tains of the Cordillera of Azuay, where they were to 



be 



