OF ARTS AND SCIENCES. 



199 



These results show that this method affords no criterion of the 

 physical properties of iron and steel. The molecular structure of the 

 various specimens employed was not sufficiently modified to enable 



* Different proportions of manganeses give no result. 



t Total carbon, — no difference. 



I Apparently, the less carbon, the greater heat. 



§ No conclusion. If any effect, phosphorus does not determine it. 



