260 Scientific Intelligence. 
From the circumstances attending the deflection of 20 mm., even this 
may be ascribed to the presence of fo 
Magnus, as well as Dove, ea Riess, Kundt, and others who wit- 
saturated at a higher temperature never greater than 20 mm.; and onl 
when fogs gti the deflection became about as great as with carbonic 
acid gas, viz., 100 mm. 
Magnus also agente with a number of other vapors. He also 
shows how the phenomena of dew are in accordance with his view; that 
dew would be impossible if watery vapor had so great a n absorptive 
power as Tyndall supposes; but that all the deductions of Tyndall and 
Frankland in regard to climate and the glacial period remain true if 
we substitute fog or foggy vapor for true uncondensed vapor; and 
finally, that the aqueous absorption lines in the spectrum observed by 
Cook ecchi are contradictory to any extraordinary absorptive 
power in actual vapor.—Poggendorf’’s Annalen, 1866, cxxvii, 613- te 
. Solar spots influenced by solar refraction—In a certain sense "the 
Boies ons of Carrington (this Journal, xxxviii, 142) and of Spérer 
have = ee the subject of the physical constitution of the sun back into 
uncertainty and doubt. But it seems that as little as Kirchhoff’s obser- 
vations upset our views of the constitution of the Laterna mundi of Co- 
ing the ho dizontal —— of the exterior atmosphere less 
apparent diameter of the sun at 25°, and neglecting some insignifican 
terms, Mr. Dauge obtains the falioatne: value of the period of ae 
of a spot at a solar latitude 4 
oO 
41'= 25: 30x 2 +8 
sin 25° 
Ww innit 
here £. ee 
Taking the mean of Carrington’s observations for every fifth d 
latitude, Dauge grat the following comparison between the observed ss) 
and calc ) values of the period of revolution expressed in days: 
