KEY AND INDEX 



the University of Padua. He is remembered 

 particularly for his teachings that the brain is 

 the source of the nerves, and the heart the 

 source of the vessels. 



Petrie, W. M. Flinders, i, 28. Born June 30, 

 1853. An English Egyptologist who has made 

 many important discoveries of Egyptian relics 

 which give clues to the history of the early 

 Egyptian civilization. 



Piazzi, Giuseppe, iii, 40. Born at Ponte, Val- 

 tellina, Italy, July 16, 1746; died at Naples, July 

 22, 1826. Italian astronomer. On January i, 

 1801, observed an apparent star which he sup- 

 posed to be a comet. Later it proved to be the 

 planet Ceres, occupying a position in space be- 

 tween Mars and Jupiter. 



Pickering, Edward Charles, iii, 65. Born at 

 Boston, July 19, 1846. American astronomer, 

 Professor of Astronomy and Dir. Harvard 

 College Observatory since 1876. Made exhaust- 

 ive study of light and spectra of the stars. Made 

 over one million measures of the light of stars 

 with a meridian photometer invented by him. 

 Author of "Elements of Physical Manipula- 

 tion," and many papers on scientific subjects. 



Pinel, Dr. Philippe, iv, 245. Born at St. Andre, 

 Tarn, France, April 20, 1745; died at Paris, Oct. 

 25, 1826. French physician. In 1795, at La 

 Saltpetriere, an asylum for the care of the in- 

 sane, he struck off the shackles from the inmates 

 and took the revolutionary attitude of treating 

 them as persons afflicted by disease, not "pos- 

 sessed by demons." 



Planche, Gaston, iii, 246. French inventor. In 

 1859 he invented the first reasonably satisfac- 



