( 287 ) 
if we assign equal weight to each observation. We obtain in 
this way: 5 
Ist series 3'.42 + 0.38 
2nd geries 4.01 + 0 .22 
By means of a simple triangulation I have connected my obser- 
vation pier with the harbour-light and with the flagstaff of the 
residence at Landana. We derive from it the following differences 
of latitude: 
Harbour-light—Obs. Pier — 2'13".2 
Residence—Obs. Pier —114.3 
whence: 
Latitude Harbour-light — 5°14'17".2 
5 Residence —5 1318.3 
The last value is in good harmony with that found by Mr. Nunez 
Portuguese Commissioner for the demarcation of the boundary between 
French and Portuguese Congo. According to a photography kept at 
Landana of the map drawn at that occasion, the latitude of the 
Residence is: 
— 5° 13/17". 
On the English Admiralty-chart „Landana-bay from a sketch- 
survey of Sub Lieut. Robbins H.M.S. Widgeon 1897” the latitude 
of the harbour-light, which here is wrongly placed just in front 
of the residence, is — 5°11'15", hence 8 too much to the north. 
II. Corrections to the latitude of Ambriz and of San Salvador. 
Among the observations with the sextant and artificial horizon, 
made during the first months of my residence at Chiloango, were 
also some of circummeridian altitudes of stars, and from them I 
derived the following values for the latitude: 
from « Crucis obers nt AEO ae eS 
a Ursae maj.20 , —5°11'55".24 3".2 
„ 
