A review is given of recent very low temperature experiments in the he
avy fermion superconductors UPt3, URu2Si2, UBe13 and CeCu2Si2. Attenti
on is focused on the temperature dependence of the specific heats in a
ll four systems, the anisotropy of the upper critical fields in URu2Si
2 and UPt3, and the pressure dependence of the antiferromagnetic and s
upcrconducting transition temperatures in URu2Si2.