344 ANNOTATED LIST OF PERSONS 



II y a dans la jeunesse de tout homme de science et sans doute de 

 tout homme de lettres, un jour inoubliable ou il a connu, a plein esprit 

 et a plein coeur, des emotions si genereuses, ou il s'est senti vivre 

 avec un tel melange de fierte et de reconnaissance, que le reste de 

 son existence en est eclaire a jamais. Ce jour-la, c'est le jour ou il 

 s'approche des maltres, a qui il doit ses premiers enthousiasmes, dont 

 le nom n'a cess6 de lui apparaitre dans un rayonnement de gloire. 

 Voir enfin ces allumeurs d'ames, les entendre, leur parler, leur vouer 

 de pres, a cote d'eux, le culte secret que nous leur avions si longtemps 

 garde" dans le silence de notre jeunesse obscure, nous dire leur disciple 

 et ne pas nous sentir trop indignes de 1'etre! Ah! quel est done le 

 moment, quelle que soit la fortune de notre carriere, qui vaille 

 ce moment-la et qui nous laisse des emotions aussi profondes? 

 Peligot, Eugene Melchoir (1811-1890). French chemist. A student 

 of silkworms. Pasteur's associate. Wrote "Traite de chimie 

 analytique appliquee a 1'agriculture" (1883). 



Perdrix, Charles ( ). French pathologist. Normal school 



assistant. 



Pfeffer, Wilhelm (1845 ). German plant physiologist. Professor 



in University of Leipzig. Author of many papers. Discovered 

 osmotic pressure in plant cells, chemotaxis of bacteria, etc. His 

 extensive and important "Physiology of Plants" has been translated 

 into English by A. J. Ewart (Oxford: Clarendon Press). For por- 

 trait see Wittrock II, Tafl. 94, and Pop. Sci. Monthly, Jan., 1897. 



Pfeiffer, August (1848 ). German physician, bacteriologist and 



pathologist. This man, or the next, must be the one named in the 

 text. 



Pfeiffer, Richard (1858 ). German physician, sanitarian and 



bacteriologist. Robt. Koch's assistant. Professor in Breslau. 

 Discoverer of the influenza bacillus. Associated with Carl Frankel. 

 Wrote on immunity. For portrait see Wittrock II, Tafl. 130. 



Philippi. The person referred to in the text under this name is Filippo 

 de Filippi (1814-1867) commonly known as de Philippi, a distin- 

 guished naturalist of Turin and Milan. At one time he was Pro- 

 fessor of Zoology in the University of Turin. Afterwards he was 

 Senator. He wrote: Alcune Osservazioni Anatomico-Fisiologiche 

 sugl'-Insetti in Generale, ed in Particolare sul Bombice del Gelso." 

 (Annali della Accad. R. d' Agirc. di Turino, Vol. V., 1851, pp. 1-25, 

 3 plates.) 



Piria, Raffaele (1815-1865). Italian chemist and patriot (Garabaldian) ; 

 senator. Wrote "Elements of Inorganic Chemistry;" "Lessons 

 on Fermentation;" "Elements of Organic Chemistry" (2d ed., 

 Turin, 1870), etc. 



