“stancy of the naotietts of Son eanondide. ae eA: ca formul pt 
was found when certain assumptions were taken as probable. Aaa 
ipsa demonstrates furthermore that this constancy of Iso 
‘ Paves asks Rs ts (2) 
Ane by Clausius®) from a formula of ; a Groshans') and was ; 
as follows: i 
temperatures are, for any two s hauias in. proportion’). - CAs ees. 
: me years later, Crostare)) eo without knowing the “elatons 
under 12 mm. and 760 mm. pressure, Oe G8 for the follpwwing substances: — 
Substance 2 B.p. 12 mm.  B.p. 760 mm. = 
Ms fe a i “Hats Se eee e@O, pe 
. ---m=Caproni¢: acid’... 95.1° 205.89... eras 
o-Gresol 3 2 ie ORS 9¢ 180. OO Gin ee tees 
PCKESOl ee De teenies —-89.6° ft 190.0 i ae ee 
Bénzy! alcohol). 0) QAO” 207.090 ee 
Phenylacetic acid .. 144.5° 265.59" Oe” a. 
Hydrocinnamic acid... 152229 = 280.09: 0. wet 
Later on, however, Groshans’) no Bett acknowledged the general ap } 
of the formula. ; 
. different in constitution. 
The polarizatién phenomena with menthone have been ‘investigated by. 
chemists?°); they are of special interest, as they are quite unique in the terpene | 
This subject, the rotatory dispersion and inversion of /-menthone, has recenth be 
studied by H. Grossmann and K. Brauer”). The menthone investieci Py. them 1 
aa 0: 8954. 
me of light (l= 2 cm.) red yellow green ie I. blue d’k. eines i Toe 
se SARA St hs hg ey 8 2 4.98 6.05. 7.15 833 -—956° 
j te] PO BS ogo 9 oy aa Ba 78". Bones rule ene = 83.38° 
in sodium light? with 1= 10 cm., «= — 28. 46°; [«] = ==, 28, 460%), “ae 
The quotients of dispersion were: — — oy Ua a ee 4 é. Aa 
| [ely . Ag Co a Ct oe er 
"QA AN eee ee en 
% Siandfay coer ae 
ao 2) Ibidem rw Latihy, 809. — 4) Poggen dori? s Annalen 82 (1851), 274, = 9 Biden 78 ae 
ps 82 (1851), 142. — 4) Darstellung der physikalischen Bigenschaften der chemischen Verbi 
; Funktionen der Atomsumme oder Densitétszahl p+ q-+ 1. Berlin 1895. — 7%) Wiedemann’s Ann 
ee ~  — 8) Neue Grundgesetze zur rationellen Physik wnd Chemie, 1. Folge, Leipzig 1878, p- 7. 
—*. .  Newe Grundgesetze zur rationellen Physik und Chemie, 2. “Fog ge, 1886, pe AL eer Diihring, 
Gees (1880), 163; 51 (1894), 223; 52 (1894), 556. ee ‘Phil. Mag. (5) 21 (1886), 33. = 
Ree Report October 1918, 97: — 1) Journ. f, prakt. Chem. Il. 98 (1918), 9 a 12) All tl 
ae 5. were carried out at 209. — 18) Apparently, it is the case of a misprint in the 
ee Tae of thiese values. — 1) These values are not correct, but agree. for the. ‘ratios ii: 
