EBBATA 



p. 2, line 2, read ' Chladni's ' for ' Chludiii's'. 



P. 2, line 17, read ' trace ' for ' have '. 



P. 3, line 1, read ' flexure ' for ' pressure '. 



P. 3. line 17, omit ' increase in the '. 



P. 4, line 17, read ' with ' for ' within'. 



P. 4, line 24, read ' the , for ' then '. 



P. 5, tables, in - „, ' — ' is not the sign of division. 



P. 9, line 12, read ' thesa ' for ' three '. 



P. 10, line 17, read ' then ' for ' there '. 



P. 11, line 16, insert after ' 5 '. ' Cluuige of clasticitii lit noft iron.' 



P. 12, line 2, read ' about ' for 'adouf. 



P. 13, line 12, insert after 'depression '' sind the modulus of elasticity' 



P. 13, table , read ' r+fir' for ' Tx |n". 



P. 14, line 5, read ' compare ' for ' conforui ". 



P. 15, table , read ' r+ gll" for ' T+-|Tr '. 



P. 16, line 3, read ' less steep ' for ' mucli steeper '. 



P. 18, table , read ' —4 ' for ' —3 '. 



