10 
BULLETIN 1108, U. S. DEPARTMENT OF AGRICULTURE. 
TABLES. 
TaBLeE 1.—Isolropic Substances. 
Sebetace. Refractive Refractive 
index Mp. Substance. index 7p. 
Er ROR aha Pe 1.336 || T1Ga(SO4)2.12H20 
NH).SiFs et Site. 3a aa 1. 3696 |] RbFe(Se04),12H20.... 2.22.22... 1! 3070 
(Re eee: air Rs BRINE GietOMiOn gee 
MaAliSO,aaELONe OG He "AEE: 1.4388 || NHURK(SOps SEO. 15103 
2NasP Ou.NaF.19H:0.........---2.-- 1.4519 || CsFe(SeO,)c.12H20.-..---.--...----- 1. 5116 
NH3(CH3)Al(SO4)2.12H2O..........- 1.4541 |! Nas(MgCl)(COs)o....--.------- 1.5144 
TAN SOs VIRGO ote caw geet 1. A562 We Mell Oge ooo) aloes 2 nal 1.5151 
RdAL(SO4)2.12Hs0.. 2.2. a eee 1.4566 || TCr(SO,)o19H20 1. TT 1.5228 
G@sAl(SO)212H20.. 02-2 ocak noe 1.4587 || 2Na3VOu.NaF.19H20.........--.--.-| 1. 5230 
634 p. ct. ammonium alum-+ 364 p. ct. MP e(SOs)oL2HsOl)2 Ee 1. 5236 
MOLASSiN alam e 2 1.4586 Ul Bia O. SFO. Poros tee ek: 1. 5305 
NH+Al(SO,)o.12H00...2. 22.22. 1.4594 KeMgo(SOu)a.-. 2222-02 2ecsesnses ‘1, 5329 
RbTi(SO1)2.12H20.. 2.22. Lees- eee Need art Tien SO, jsiBH tec rerresieiieini Lae 
Ph inpaOs 12H60. ee kee anes | cust; co ee ee pee 
CeGa(SOyx12hO.Wi2 2 oO C45 Gc He dt TOU as Tee 1.5590 
Gsin(SOj)a12laO .. 4-2. ect2 5-05. 14652 GriNQs)e 6 5 8 cash hee 1. 5667 
KGa(SO4)o12H20....... 2222-22-22 1. 4853) [Pa CN Ogos at beet sae) a SPSS 1.5717 
RbGa(SO,).12H20....-- 2.22.2 ----- 1.4658 || NaBrOa 1. 5943 
NHuln(SO4)2.12H20..- 222222 s eee 1.4664 || CsCl 1.6418 
NM Pisa Sie 12H Oca 5 en 1.4684 |! AEREUb ak A 1.6420 
QNazAsO4NaF.19H20...2.2.22222+2- LOO epee IL Pee Cas 1.6474 
Gat S0.pd2H50, 2... ce. 2-2-5 - | 1-A736 || wesulas fb eo a eS 1. 6574 
Gsuin(8O), 19H { 1. wre BaD UW rege CPE DOS eh eae 1.6770 
(red). ee eg Od ee | RE 1, 6984 
IEA SEODe12HsO eh. 258. 2 EER 1. 4801 NHal 1. 7031 
Os@r(SOu)s.12Hs0 cy nnn | CASIO I pete 1h ge oie: 1. 7364 
KCr(SO4)2.12HO. 2 22022222 DARIEN E  oehg tie Wee UE LIES EC S89 ENT 1.7550 
Bp CriSOnsIOHs0 a. -- ante oe | 1, 4B15 Uh eM Ose oc oe betes tote 1. 7838 
Kita(S@)s 12HsOo fel fie 2B ABLINT aye). 0o REELED TED) De nates. 1. 7876 
RbFe(SO1)212H20. .. 2... 22-2 eee 1 AT a cys ert gs ee tek ge 2.0710 
CsFe($04)2.12H20...00 202.22. niin | ERM GP se ee a 2, 0870 
POT SOs OHsO2 2. c= -p 1. 4842 We eet par NS Fach ah eae 2. 1168 
NHyFe(SO4)2.12H20. 2222222222 1. 4854 UTA ey Fae ew (red) 2. 130 
SL ee aie Se a 1, 4903, || NiOw..-..------+-2----- 222 2-c ees ee (blue) 2. 390 
Bhan tk aie BL heh | 1.4930 | Guy 2 
ae alum4+-3 p. ct. potassium | mo. by DS ee BD 
Bibra: etd! EPO Fe 22 aged shots wave TV ps BSG 
MVAUSOOaIIHo). 4... ap... 2 c5- 2 | Lagi gt oe Ree 
RbRh(SOs)s. (Hee LS | 2. 5004-1. 5023 eiaTr api ral ie 2a ea ed! 
~» Personal communication, G. L. Keenan. 
TaBLE 2.—Uniarial Positive Substances. 
Substance. System. ®p | €p 
| —— 
TESOL: 2 6 ee ares i Pn a eta ti 1.3439 1.3602 
Mnsibs.GbeOrt 8 fing ds. poets: SIE Drie}. Pei Mee FSIS eos 1.3570 1.3742 
HeGi hp Oba Oe ot 6 ens sos bet dkoe ere TiC 2. tn Cle ee eka 1.3538 1.3848 
Rei ee). Sea tee. ee ea BS t Pogwig?} eb. [2325852 i 1.3780 1.3897 
CoSiFs.6H20 Brig. Coes ae 1.3817(C) | 1.3872(C) 
ZnSiFs.6H20 Mirig to-cr eee 4 1.3824 1.3956 
NiSiFs.6H2O0 ie Wy Peni ieee SPR: Reaihnelicy tg 1.3910 1. 4056 
Nase. IOHeO fs reich lid. - Aes Drge < hd. S, dsb obec hee 1. 4458 1. 4524 
SSC Se ee RE 6 Sa dee eee Uri: cg 2 aeons o 1. 4550 1.5153 
NapksOedsHO. 1) asf) Qe e ees Trig itt Wika weice 1. 4597 1.4662 
EA RAS AE oe SE EE See eee ee 5 (anne aah 1. 4574 1.5078 
INAS GSOn sel See eE teen ce. Lee Se \oDnipue os 5172: JSR SL EE LE 1. 4901 1. 4996 
cr AE Ee pee ees png Orin een ee 1. 5095 1. 5232 
Nav Op 10S OverE reek. fs se tcae eee Hexag. modification. --.-- 1. 5398 1.5475 
TTRDA GS CRS 1 0 Sie ASE ae aa eee PAGES 2 cones pee eee 1.5519 1. 5575 3 
MgPt(CN)s.7H2O a2... 222 22. eee eel | Retrag cfcyisc,'Sssn-5ti eee 1. 5538— 1.553+ .| Very weak 
IMG (OM) goo us cae Gt coe ole ae = ee rig ae ns Gs ta 1. 5590 1.5795 .0 
(red) (red) 
CaCl WU Osean ne-mcsa bance s sme a8 | Paihex. Se eeccocee ese ds 5690 1.670 
MeSnGle GHsOis< 33 . 5522. tei IPT ris. 4 bs ce Aghia ee 1. 5885 1. 5970 
RE cn oe ek cae ee eee oe 1B} ng t ee eae Re oa 1. 5905 1. 5907 
CHD Cae cr. hh See Dipgrias Meese. -peeeae 1. 6038 1. 6042 
SiG Fie ee eae ae ee ee Hexag. modification.. 1.6150 1.6360 } 
Pos, O¢4bs Ole 3.8 St -FEA ase Prigye?. get esse on se .-.| 1.6351 1. 6531 
(N ah ss aes 1 EY 0 J ste SA Sear ess Trig ea aces et STR po eA oso ite 6430 Tete Cr oeGeee 
Pips Os Oc. os ee eee aaa s Rhomb 26..2tke- 32he52 1.65 1. 67 
Bessio. SMR ie Bok. 2A ee eee? Romp eevee tedeceeees 1. 6542 1. 6700 
ANH IrClg.HsO Aree - cat A Ree. 2 Se Tries to xiue sees ieee 1. 6576 1. 6666 
CrP 2 ES 0 ae ee ey oe Rhamb: oo. #-225e--= 1. 6580 1. 7079 
P (Osis be. oe 4. SE = SS - | PRTG axe oboe. be are 1. 6600 1. 6680 
(orange). | (orange). 
GAGER(CON as. <uustiitara --esp Ri eee eee 1.6742 1.7701 
a Strong pleochroism; | opt. ax. more, | 
axis less bluish. 
b Anomalously biaxial, but always with very small ax. angle. 
c w Reddish yellow: e dark carmine red. 
d Indices approximate. 
