290 Miscellaneous Intelligence. 
Hence it follows, and experiment confirms the inference, that we 
give solidity and relief to plane figures by a suitable application of 
color to parts that are placed at different distances from the eye. 
hese effects are greatly increased by using lenses of highly-dis- 
persing flint glass, oil of — and other fluids, and avoiding the use 
of compound colors in the objects placed in the stereosco 
5. Spots on the Sun, (L’Institut, No. 984.) —M. Ropo.px Wor writes 
with reference to the recently discovered periodicity in the spots on the 
sun, that he is engaged upon an extended memoir on the subject, which 
will comprise all of importance that is on record respecting yee’ 
since their discovery, and the results of his own observa} tions. He has. 
spots should be fixed at 11-111 -+ 0-038 years, so that 9 periods are just 
equal toacentury. In the second chapter he will show that for each cele 
tury, the years 0, 11:11, 22-22, 33-33, 44-44, 55:56, 66°67, 77°78, 88°89 
correspo: to the minima of solar spots. The interval between the mini- 
_ 18 2, 
from the observations show. that the meteor was 253 kilometers® 
the earth when seen at Bordeaux, and from Bordeaux at the same ti 
268 kilometers; and when seen at Toulouse it was 1494 k. fi 
rth. Apparent rapidity from M. Abria’s valuation 214°4 k. ; The 
Petit’s, 624 k. Absolute rapidity i in space, from M. Petit, 75 k. 
F ee Becostling to M. Petit’s observations was 215 meters” cal bd 
ap yards); and he concludes that the meteor was a cosmical 
ides * new Meteoric stone from Giitersloh.—Last year M. eee 
spre: to the Prussian Academy at Berlin a meteoric stone of 
ell at Gittersioh on the 17th of Abril according to the testim 
Dr. Stohiman. M. Rose has since received another a piece se 
the same ber aud a rath weighing over three 0 nces Was 
