ir. Ihirnffeij. 
Phil. Trans., A 
A. A. pAL'ing (hkI A. C. 
, I'ol. plate 7. 
Fig. 3. Specimen of S\ve<lish iron after 5000 revei'saLs of a 
stres.s of l-f'3 tons per S(p inch, x 150. 
Fig. 4. Same after 40,000 reversals, x 150. 
Fig. 5. Same after 60,000 reversals, x 150. 
Fig. G. Same after 70,000 reversals and re-polishing and 
re-etching, x 150. 
