Errata. 



Page 3. line 5 from bottom, insert the before earth 

 59, line 19, dele the 

 59, line 11, dele the 

 59, lines 20 aw^ 22, for part razd parts 



100. In the Table of Atomic Weights, read Copper 32 ; Zinc 32'5 



Eubidium 86 ; Caesium 133 



101, lines 10 and 33, for 32 read 32-5 

 104, line 12 from bottom, for 29 read 32 



