HARDENING FATTY SUBSTAN(l ES-Renjamin C. 'ril�14 r,'1�7 0 ;' f����11�i:�r��t �en!r�t \1�;��e i ;l . ()���� l �� d h�r� euing fatt. y substances by sulphuric aCid, as I am aware that this hns beell bet\)re Jlropofled � but ill sneh cases. the lIeat employed lute heen undHf or above 2120 Fall. Now, I have found that the hardening effBct of 8111-