tad 
Michael Faraday, his Life and Works. 153 
Although interesting in many respects, the results which Fa- 
raday obtained in his great investigation of the alloys of steel 
were not proportionate in their importance to the time and 
trouble which they cost him. We may say the same of the la- 
i 
_ borious researches upon the manufacture of glass for optical 
purposes, which he made a few years afterward (in 1829). It 
; ed heavy glass, 
1s found unfortunately to have a slight yellowish coloration 
which renders it unfit for optical purposes; but the labor which 
Faraday devoted to its fabrication has not been lost; for, as we 
see hereafter, this same glass, in the hands of the talented 
in 1827, and has since gone through three editions. 
— those who are called upon to experiment in the domains 
of physics and chemistry can appreciate the immense service 
ich thi i mshi them, by teaching them @ 
Multitude of processes of detail so valuable for them to know, 
