1. Ann. de Ch. et de Phys. 6e Sér. t. XXIX, 1893.
2. Kmerlingh Onnes, Proceedings Royal Acad. of Science 1881, p. 11.
3. Verh. Kon. Acad. v. Wet. 1881, p. 5–7.
4. Comp. Communication No. 47 cont. § 2 Febr.’99. F
5. In comparing with Comm, N°. 60 on the coefficient of pressure variation of hydrogen must be remembered that the calculations were begun before that communication.