Thermal Anomalies of ${\mathrm{He}}^3$: Pairing in a Magnetic Field

It is shown that the linear splitting in a magnetic field of the thermal anomaly ($A$) observed recently in liquid ${\mathrm{He}}^3$ at about 2.5 mK can be explained by postulating pairing in a state of odd relative angular momentum. Further structure is predicted, and implications of the theory and experiment are discussed.