Because some are bad conductors of heat, and do not draw off much of the warmth of our bodies; while others are better conductors, and take up a larger portion of our warmth.
"The fining pot is for silver, and the furnace for gold: but the Lord trieth the hearts."—Proverbs xvii.
121. Which feels the warmer, the conductor or non-conductor?
The non-conductor, as it does not readily absorb the warmth of our bodies.
122. What substances are the best conductors of heat?
Gold, silver, copper, and most substances of close and hard formation, &c.