Letter to Eric Keightley Rideal, regarding a paper 'On the catalytic cyclization of aliphatic hydrocarbons. II' by E F G Herington and Eric Keightley Rideal Sectional Committee: Chemistry The paper has received a favourable report, but the referee suggests giving an example of the accuracy of the analytical method. Requests that the critisims be addressed so the paper can be sent to the printers. [Published in the 'Proceedings of the Royal Society of London'] No received date. 6 December 1943