Tt —— and Physics. 265 
Art. XXXI.— Observations on Skylight Polarisation ¢ in soos 
during the month of July, 1867; by Epwarp O. Cua 
xe are. cheese were made at various stations of 
U.S. Geol 1 Survey, with an excellent Savart polari- 
ol of remarkable — I mark the neutral points as 
follows: Ar., Ara .. Babinet’s; Br.,; Brewster’s, 
| ; July 1 1—Cloudy. 
30” p.m, Ar., Ba. both faint. Clouds below the sun. 
;, a dy. 
5. —12 m., Br., distinct. 6» es p.m., Ba,, faint. 
6.—Heavy rain in AM. 65 g0™ ; Bay Lg int. 
teat 15™ a.m, and 5" 45™ p.., oe ‘ain 
* 10" am., Ar., distinct, Ba., faint. "ge 30™ p.m, Ar. Ba., 
equally dint 
-—Cloudy in a.m. 7" p.m, Ar., faint; pe Tacs 
akg distinct ; on faint, Stormy in 
11. —Cloudy and sto 
12,—-8? 30™ a.m. Ba, Br. both faint. 7° p.m, Ar., Ba., equally 
distin 
—i" am. Ar., distinct; Ba, faint, 7° 15" pm, Ar. very 
distinct ‘Ba, distinct. 
ee —Cloudy and rain 
: 15.—6" 3 Ate, very distinct; Ba. faint; Br., distinct. 
This was the nos instance in which the three ee points ven 2 observ 
Prmlieneounly. * 7) 95™ p.m., Ar., very distinct; Ba., fain 
pad AM, Ba, very distinct ; Br., faint. 7° P.m., ak dis- 
tinet ; ape 
a 18. 18—Cloay. 
21.—6" a.m., Ar., very bso Ba., distin 
.., 22.—6" pm., Ar. Br., equally distinct. 7” 15" P.M. Ar, very 
distinct; Ba., distinet. 
23.—7" 30" p.u., Ar., very distinct; Ba., distinct. 
Sa 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
1. On the synthesis of organic ¢ acids,—Canrivs hi ke e the very in- 
wiackciass Speed I, xii, 112, 113. 
AM. ose Scr.—Seconp SERIES, Vou. XLIV, No. 131.—Szpr., 1967. 
34 
