INDEX 221 



Head in 1893. Author of remarkable works upon 

 heat and electricity. 



VAN TIEGHEM, PHILIPPE EDOUARD LEON, French 

 botanist, member of the Institute, born at Bail- 

 leul, Nord, April 19th, 1839, was a student at the 

 Ecole Normale from 1858 to 1861, and later be- 

 came a lecturer in the same school. Member of 

 the Academy of Sciences. 



VIC AT, Louis JOSEPH, French engineer, born at 

 Nevers, March 31st, 1786, died at Grenoble April 

 10th, 1861. Author of memorable works on hy- 

 draulic limes and cements. 



