A NOTE on this subject by Swings (Astrophys. J., 99, 118; 1944) reports that the University of Liège still continues its programme of astronomical infrared spectroscopy, and that in June 1942 a new self-recording high-dispersion spectrograph was installed in the constant-temperature basement of the solar tower. This instrument utilizes four plane eehelette gratings with 15,000, 3,600, 2,400 and 1,200 lines per inch respectively, the whole spectrum from 1 μ to 20 μ being covered with a resolving power which will separate lines 1 cm.–1 apart. A preliminary paper by Migeotte gives a general account of the results obtained from recordings of the solar spectrum in the region near 1·5 μ. Here absorption lines only 1·5 A. apart can be separated, and the distinction between solar and telluric lines is relatively simple. A study of the water-vapour spectrum in this region is nearing completion, and the new instrument is now in continuous operation.