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Has been carrying out a series of experiments with spiders immersed in acids and finds their bodies are not protected in any way. Has also been experimenting with elastic tissues to see if there is a change of temperature.
Thanks JJ for the counterfeit coin he sent; JH comments on the possibility of oval coinage.
Thanks for his paper on amalgams. Regarding the amalgam of iron, he pointed it out many years ago in his Bakerian lecture. Would be interesting to experiment further with iron in solution of mercury.
Much obliged for his letters regarding the amalgam of iron. Cannot account for his ignorance of JH's Bakerian lecture.
Refers JH to page 18 of memoir of Manchester Literary and Philosophical Society, in which JJ, using 'the magnetic electrical machine,' succeeded in proving 'that heat may be generated by mechanical power without accompanying chemical change.'
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