Fig. 10.—NIMBUS, OR STORM CLOUD.
"Behold, I will put a fleece of wool in the floor; and if the dew be on the fleece only, and it be dry upon all the earth beside, then shall I know that thou wilt save Israel." * * *
CHAPTER XIX.
396. Why are cloudy days colder than sunny days?
Because the clouds intercept the solar rays in their course towards the earth.