Referee's report by Robert Robertson, on a paper 'The infra-red absorption spectra of quartz and fused Silica from 1 to 7·5 µ II-Experimental results' by D G Drummond Sectional committee: Physics The beginning of the part dealing with calibration could be dismissed in a few words. The descriptions of the specimens could be put in tabular form. [Published in Proceedings of the Royal Society A, 1936]. Endorsed on verso as received 1 August 1935. July 1935