Proceedings.] CORRESPONDENCE ON PRESSURE OF CLAS. of the stresses pz and r2 was quite consistent with that for p and r, and consequently was acceptable from that standpoint. Professor Alexander was inclined to think, however, that possibly there might be other factors which in practical work would modify it. The Author deserved hearty congratulation on his valuable contribution. Author's efforts towards the derivation of acceptable working But'er* formulas for earth-resistances were full of interest. H e was prompted to call attention, however, to the necessity of keeping in mind, in this connection, the great difference that might exist between the values of 9 (the so-called angle of repose) under the 1 Minutes of Proceedings Inst. C.E., vol. cxcv, p. 42.

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