ered. I place of light, and it obeys the law of reflection due to light. This bisulphide of carbon boils at a lower temperature than water. them facing each other, and I put this stand exactly midway we can illustrate by means of our beautiful thermo-electric I have told you that different bodies,… … which will inform me which of these plates is heated. Sup- pose I heat, this plate. Observe what occurs at the magnetic needle. I simply warm that plate by putting my finger upon it. The red end of the needle moves towards me. I cannot explain the wonderful power which moves the needle. It is what…
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