ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 255 



Recent Investigations in Cast Iron.* — A. E. Outerbridge, jim., ha* 

 investigated the changes in volume produced by the repeated heating and 

 cooling of cast iron. In some cases the expansion amounted to as much 

 as 40 ' 98 of the original volume. He thinks that these changes must be 

 connected with the mobility of the molecules of the cast iron. 



Hall, J. L. — The Microscope in Engineering: its widening use in studying th3 

 Structure of Metals. 



[An interestinn", historical and practical paper.] 



Iron and Steel Metallurgist, vii. (Jan. 1D04), pp. 45-55(7 rigs.). 



* Journ. Franklin. Inst., clvii. (Feb. 1904) pp. 121-40 (3 pis. of six figs.). 



