In order to understand the effect of varnishes that act as a barrier to water adsorption by wood-in terms of moisture content-in humid atmospheres, modern maple replica samples have been manufactured by a practicing luthier. They are coated with a variety of recipes thought to have been used in either the original manufacture from the 17th to 18th centuries, or in subsequent restorations. The effects of humidity were monitored via thermal neutron radiography using the NEUTRA imaging instrument at the Paul Scherrer Institute. The consequences for understanding ancient violins, and their repair or restoration are discussed.

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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