Professor W. R. Arnold, Ph.D., Andover Professor of the Hebrew Language and Literature, will lecture on "The Relation of Primitive Christianity to Jewish Thought and Teaching" in King's Chapel, Boston, this afternoon at 2.30 o'clock. This is the sixth of a course of free public lectures on the general subject, "Christianity as a Religion of the Spirit under Historical Conditions," given by professors of the University during the winter months under the auspices of the Lowell Institute. Admission is free, and no tickets are required.