This is a sequel to a paper read 28th April 1862 (See “Proceedings,” vol. iv. p. 607), and contains the results of the complete reduction of the observations on the conductivity of iron, by the application of the method there described. The thermometric readings are now rigorously corrected for scale errors, and for the difference of temperature between the bulb and the stem.

The methods of reduction, consisting of a combination of calculation and graphical projection, are the same as have been described in the first part of the paper. But the whole has beeen executed with minute attention to accuracy, and the avoidance of error of every kind.