Sefer Safah leNeemanim - Maamar al techunas ve'erech Lashon Hakodesh By Rav Boruch Epstein z"l Published in Warsaw 1898. Can be seen and downloaded on Hebrewbooks.org http://www.hebrewbooks.org/download.aspx?req=9480 BTW, anyone have any information about the background of the word "Choshen"? SBA