Meteorological Journal at Mariettia, Ohio. 189 
servations that unequal vertical images or equal ones not corres- 
pondingly placed in the eyes do not of themselves and directly 
produce the single ne ity scree that the coincidence 
owever seemingly simultaneous for all parts of the figure is 
really the effect of rapidly successive adjustment applied to the 
vertical and horizontal elements of the diagram, aud that this 
stances, gives rise by suggestion, to the mental resultant. 
Other observations bearing on this subject are now in progresss 
more ara as regards the union of pictures seen in Dove’s 
experiment by instantaneous or electric light, but they are not 
dificionty matured to be communicated at this time. 
Arr. X XIII.— Abstract of a Meteorological Journal kept at Ma- 
rietta, Ohio, for the year 1855—Lat. 39°-25'—Long. 4°°28' 
West of Washington City ; by S. P. Hi:prers. 
atte ; BAROMETER. 
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55°33|91| 18] 20) 10| 2°08) s,s. w., & N, 29°85 2910) 
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as the iy of April 
and the first of Ma ople began to cre their fears. of f an- 
Other season of ed heat which would ina manner ruin a 
the country. The first four months affording less than nine ~ 
