Mr Varila informed us, that the true longitude was 18 deg. 35’ 30”, from Paris, which is only 16 deg. 16’ 30” from Greenwich; less than what our watch gave by 14’ 30”.  But, far from looking upon this as an error in the watch, I rather think it a confirmation of its having gone well; and that the longitude by it may be nearer the truth than any other.  It is farther confirmed by the lunar observations that we made in the road, which gave 16 deg. 37’ 10”.  Those made before we arrived, and reduced to the road by the watch, gave 16 deg. 33’ 30”; and those made after we left it, and reduced back in the same manner, gave 16 deg. 28’.  The mean of the three is 16 deg. 30’ 40”.

To reduce these several longitudes, and the latitude, to the Pic of Teneriffe, one of the most noted points of land with geographers, (to obtain the true situation of which, I have entered into this particular discussion,) I had recourse to the bearing, and a few hours of the ship’s run after leaving Santa Cruz road; and found it to be 12’ 11” S. of the road, and 29’ 30” of longitude W. of it.  As the base, which helped to determine this, was partly estimated, it is liable to some error; but I think I cannot be much mistaken.  Dr Maskelyne, in his British Mariner’s Guide, places the Pic in the latitude of 28 deg. 12’ 54”.  This, with the bearing from the road, will give the difference of longitude 43’, which considerably exceeds the distance they reckon the Pic to be from Santa Cruz.  I made the latitude of the Pic to be 28 deg. 18’ N. Upon that supposition, its longitude will be as follows: 

       {The time-keeper, 17 deg. 0’ 30” }
   By {Lunar observations, 16 deg. 30’ 20”} W. 
       {Mr Varila, 16 deg. 46’ 0” }

But if the latitude of it is 28 deg. 12’ 54”, as in the British Mariner’s Guide, its longitude will be 13 deg. 30’ more westerly.

The variation, when we were at anchor in the road, by the mean of all our compasses, was found to be 14 deg. 41’ 20” W. The dip of the N. end of the needle was 61 deg. 52’ 30”.

Some of Mr Anderson’s remarks on the natural appearances of Teneriffe, and its productions, and what he observed himself, or learnt by information, about the general state of the island, will be of use, particularly in marking what changes may have happened there since Mr Glas visited it.  They here follow in his own words: 

“While we were standing in for the land, the weather being perfectly clear, we had an opportunity of seeing the celebrated Pic of Teneriffe.  But, I own, I was much disappointed in my expectation with respect to its appearance.  It is, certainly, far from equalling the noble figure of Pico, one of the western isles which I have seen; though its perpendicular height may be greater.  This circumstance, perhaps, arises from its being surrounded by other very high hills; whereas Pico stands without a rival.”