Van Nostrand's Eng.
Mag., Vol.

XIX, 1878, pp.

8-9.
-- --: On a mode of measuring the velocity of sounds in woods.
Am.Jour.Sci.and Arts, Vol.

XVII, 1879.
JACCARD, P.: Etude anatomique des bois comprimes.Mitt.d.

Schw.
Centralanstalt f.d.forst.Versuchswesen.