Announces his invention of the 'calotype', and his application for a patent. Questions JH on his address to R.A.S., objecting to idea that universe is infinite.

Preparing his calotype paper for publication. Looking for a summer house, somewhere interesting to photograph.

Reports receipt of a communication, which argues that all elements are merely isomers of one substance. Expresses support for such a view.

Some details of improvements in the calotype method.

Sends JH sample of chemicals and paper to make calotype himself.

Has read WT's paper before the R.S.L. and now complains they will not print it in the R.S.P.T. as they understand it has appeared elsewhere.

Reports on paper by Samuel Brown to the Royal Society of Edinburgh on the conversion of carbon to silicon, and other transmutations. Reports on discovery of new element, ozone, and complains further about R.S.L. Council.