ON ABSORPTION SPECTRA AND CHEMICAL CONSTITUTION. 

 Appendix — cont. 



237 



Substance 



Picrotoxine 

 Piperidine . 



Piperine 



Potassium Cyan- 

 ate 



Propionic Acid 



Propionic Acid — 

 Barium salt of 



Propionic Acid — • 

 Sodium salt of 



Propylic Alcohol 



Propylic Foi-mate 



Propylic Propio- 

 nate 



Propylic Valera- 

 nate 



Purpurin 



Purpuro-xanthin 



Pyrazine - di 



methyl 

 Pyridine 



Pyridine hydro- 

 chloride 



Pyridine 2.5 di- 

 carboxylic acid 

 {iso - cinchome- 

 ronic acid) 



Pyrocatechol 



Pyrogallol . 



Fonnula 



C50H34O,; .... 

 C,HhN .... 



CnH„NO... . . . 



KCNO .... 



C.,H:,COOH 



(C2H5COO).jBa, . 



CoHjCOONa . 



C5H7OH .... 

 HCOO.C3H7 

 CoH^COO.CjH- . 



C5HC1O2.C5H7 



C«H4<^gg)CoH(OH)3 + H2O 

 [(0H)3 1:2:4] 



CuH4(CO).XcH.,(OH)2 [1 : 3] 



See under D. 



C.,H,N .... 



C-,H-N.HC1 

 C,H,N(COOH).,, . 



C,H.,(0H).2 . . 

 CeHjfOH)^ . 



Pyromucic Acid . C.H-O.COOH . 

 Pyrrole (Pyrro- \ CH:CH. 

 line) I >NH 



' CH:CH 



Nature of 

 Absorption 



Continuous 

 I) 



Selective 

 Continuous 



Selective 



One band 



Selective 



Continuous 



Reference 



Hartley, Phil. Trans. 

 II. (1885), 471. 



Hartley, Chem. Soe. 

 Trans. 47 (1885), 

 685. 



Hartley, Phil. Tram. 

 II. (1885), 471. 



J. L. Soret, Archives 

 des sciences et natu- 

 relles, 3rd Series 

 (1893), 429; Hartley, 

 Dobbie and Lauder, 

 Chem. Soc. Trans. 

 (1901). 



Hartley and Hunting- 

 ton, Phil. Trans. I. 

 (1879), 257. 



Vogel, £er. 11 (1878), 

 1363 ; Libermann 

 and Kostanecki, Ber. 

 19 (1886), 2327. 



Libermann and Kosta- 

 necki, Ber. 19 (1886), 

 2827. 



Hartley, Chem. Soc. 

 rmm. 47 (1885), 685; 

 Hartley and Dobbie, 

 Chem. Soc. Trans. 

 77(1900),318;Pauer, 

 Wied. Ann. der 

 Phys. 63 (1897), 363. 



Hartley, Chem. Soc. 

 Trans. 47 (1885), 

 C85. 



Hartley, Chem. Soc. 

 Trans. 41 (1882), 45. 



Hartley, Chem. Soc. 

 Trans. 53 (1888), 

 041. 



Hartley and Hunting- 

 ton, Phil. Trans. I. 

 (1879), 257. 



Hartley and Dobbie, 

 Chem. Soc. Trans. 

 (1898), 599. 



