Iron+and+Steel

===For me this quotation means that the iron iron is no longer practical for the emergence of very tall buildings that require more resilient materials that provide greater security on the heights of fires or earthquakes. Also  the emergence of new tendencies gives rise to new building materials, one of which is glass, which represents a technological advantage in the 19th century. Glass can provide protection from some nature elements and for its beauty its material is fully used around the world. ===