Magnetic measurements of the vertical field component and of magnetic susceptibility were made within the ocean crust in Deep Sea Drilling Project Hole 395A on the Mid-Atlantic Ridge during Leg 78B. The variations in the vertical anomalous component of the field confirm the reversals of magnetization in the section described by Johnson (1979a). The reversals are shown to be very sharp, and are concluded to represent breaks in volcanism within which field reversals occurred. The continuous log of the vertical component of the field gives a far more complete and detailed view of the magnetic stratigraphy than was obtained from the minicores alone. The susceptibility log shows two positive anomalies in the upper part of the section that probably relate to the presence of serpentinite in the walls of the hole. At one of these horizons some serpentinite was recovered in the core but not at the other. The log thus provided a valuable and sensitive adjunct to the recovered samples.