chronometers by the proximity of masses of iron, 389 
observed in the rates of the chronometers ; and this change, 
from the results of the preceding table of experiments, would 
rather appear to be due to the action of the iron on board, than 
to any other cause. 
On the other hand, the change of rate reported by Mr. 
Fisher, is so much greater than our experiments would give 
us reason to expect, that we cannot help considering his case 
as an anomalous one, and as depending upon some cause not 
commonly operating on ship-board. 
