GENERAL INDEX 



Problems, some unsolved scien- 

 tific, 5, 203-229; solar and 

 telluric, 5, 205-213; physical, 

 6, 213-220; life, 5, 220-229; 

 of anthropology, 6, 228. 



Problems, Medical, Some Medi- 

 cal Laboratories and, Chap- 

 ter VII, 5, 178. 



Problems, Physical, Some Phys- 

 ical Laboratories and, Chap- 

 ter IV, 6, 73- 



Products of Clay and Fire, 

 Chapter X, 9, 227-271. 



Products of Clay and Fire, 

 Chapter X, 9, 227; pottery- 

 making by primitive man, 9, 

 227; the manufacture of 

 pottery, 9, 227; the raw 

 materials, 9, 232; mixing the 

 materials, 9, 238; the glaze 

 and its preparation, 9, 243; 

 methods of making pottery 

 by hand, 9, 246; machines 

 that make pottery, 9, 255; 

 from clay to china, 9, 260; 

 decorating the ware, 9, 271. 



Progress in Electricity from 

 Gilbert and Von Guericke to 

 Franklin, Chapter XIV, 2, 



2 59- 

 Progress of Modern Astronomy, 



The, Chapter II, 3, 19. 

 Progress, the only real progress 



due to the development of 



mechanical inventions, 6, 12- 



r 7- 



Property, the foundation-stone 

 of civilization, 6, 25. 



Prospect, Retrospect and, Chap- 

 ter IX, 5, 230. 



Protoplasm, studies in, by De 

 Bary and Schultze, 4, 125. 



Proust, Louis Joseph, disputes 

 Dalton's atomic theory, 4, 41. 



Prout, Dr. William, studies of 

 atomic weights, 4, 66; his 

 alleged law revived by Du- 

 mas, 4, 67; detected hydro- 

 chloric acid in gastric juice, 4, 

 129. 



Pseudo-Sciences, Two Alche- 

 my and Astrology, Chapter 

 VI, 2, 124. 



Psychology, The New Science 



of Experimental, Chapter IX, 

 4. 245. 



Ptolemy, erected a museum and 

 collected a library which made 

 Alexandria the culture-centre 

 of the world, 1, 190; the last 

 great astronomer of antiquity, 

 1, 267 ; discovered the moon's 

 evection, 1, 268; his writings 

 became the sole astronomical 

 text-book of the Middle Ages, 

 1, 269 ; his theory of epicycles 

 1, 270; the errors in the 

 colored maps attributed to 

 him may have influenced 

 Columbus on his voyages of 

 discovery 1, 271. 



Pulley, principle of, 6, 33 ; per- 

 fected by Archimedes, 6, 34. 



Pump, electric, use in mining, 6, 

 263. 



Pumps and pumping (see also 

 Suction, Ctesibius) , della Porta 

 states idea of utilizing steam 

 for raising water; idea put 

 into effect by Caus, 6, 83; 

 expansive force of steam first 

 applied by Marquis of Worces- 

 ter, 6, 84; Savery's steam 

 pump, 6, 85; Newcomen's 

 pumping engines, 6, 89. 



Purkinje discovers that the pan- 

 creas shares in digestion, 4, 

 129. 



Pyramids, the building of, 1, 

 32; oriented in strict accord- 

 ance with some astronomical 

 principle, 1, 33. 



Pyramids of Egypt, building of, 

 described by Diodorus Sicu- 

 lus, 6, 37. 



Pythagoras, a youthful athlete, 

 1, 112; one of the fathers of 

 Grecian thought, 1, 114; the 

 founder of an independent 

 school of philosophy, 1, 116; 

 advocates the theory of the 

 sphericity of the earth, 1, 118, 

 119; the discoverer of the 

 identity of Hesperus and Luci- 

 fer, 1, 120; carried the science 

 of geometry to perfection, 

 ibid.; no written line of his 

 has come to us, 1, 121; a 



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