Some of the birds that we see in the spring have not been asleep during the cold weather, but have spent their winter at the South, and have now winged their way back to spend their summer with us. They go back and forth in this way every year, guided by that wonderful and mysterious thing, instinct. How this makes them take their flight at the right time, and in the right direction, we do not understand.
Questions.—Why do animals need sleep? Why do you feel tired after work, or play, or study? Why does the blood circulate and the breathing go on in sleep? When is most of the repairing of the body done? How is it with its growth? What is said about night as the time for sleep? Mention some animals that sleep in the day and are awake in the night. What is said about people that turn night into day? Why would not merely keeping the body still, without sleeping, answer for our rest? What is said about dreaming? What is said of the winter sleep of some animals? Tell about the frogs and the toad. Why do some animals take food into their winter sleeping-places? Tell about the field-mouse, the bat, and the marmot. What is said about the waking up of life in the spring in animals and in plants? What is said about the birds?
THE CHILD’S BOOK OF NATURE.
FOR THE USE OF
FAMILIES AND SCHOOLS.
INTENDED TO AID MOTHERS AND TEACHERS IN TRAINING CHILDREN
IN THE OBSERVATION OF NATURE.
IN THREE PARTS.
PART III.—AIR, WATER, HEAT, LIGHT, &c.
By WORTHINGTON HOOKER, M.D.,
AUTHOR OF “FIRST BOOK IN CHEMISTRY,” “CHEMISTRY,”
“NATURAL PHILOSOPHY,” “NATURAL HISTORY,” ETC.