QUESTIONS 217 



divide. What can you say about the resemblance of different em- 

 bryos in their earliest stages ? As it grows, how does an animal in 

 its eggshell get nourishment ? When does an expanding chick 

 make its way out of its shell ? How long is it from the time when 

 a hen begins to sit on her eggs to the time when the chick is hatched ? 

 When is an animal said to be oviparous ? When an animal is born 

 alive, what is it called ? Before birth what supplies nourishment to 

 the developing oviparous animal ? Describe the difference between 

 the chick and the rabbit after birth. Mention the time it takes for 

 various animals to develop. When do cells multiply fastest, before 

 or after birth ? What have surroundings to do with the welfare of 

 young and growing creatures ? What was it that made the differ- 

 ence in the size of the four young tadpoles ? How much does a 

 normal seven-pound baby gain during the first year of his life ? How 

 much does he gain during the second year ? After that, how much 

 until he is fourteen years old ? What two things can a baby do from 

 the start ? What about the use of all five senses ? Give a brief sketch 

 of the progress of the baby from stage to stage. What does Dr. 

 Minot call the first period of a baby's development? What has 

 happened during this period ? What does a baby do during its 

 second period ? Give what you can of Dr. Minot's description of 

 an eight-months-old baby. When is a baby usually able to walk ? 

 What does Dr. Minot say about the importance of the health of 

 the mothers ? 



CHAPTER XVII 



How many eggs were in the incubator? Describe the appear- 

 ance of the chicks when they were hatched. Altogether, how many 

 chicks came from the eggs ? What happened to the rest of them ? 

 How many chicks died within four days after the hatching ? When 

 investigators looked for an explanation of all this, what did they 

 find ? What conclusion did they come to about the effect of alcohol 

 on chicks in their shells ? What was Dr. Forel's own conclusion ? 

 Describe the two sets of tests carried on by Dr. Fere' between the 

 years 1894 and 1903. How often was the same experiment re- 

 peated ? What did the tests always show about the minds of the 

 chicks ? What seemed to be the matter with those that had endured 



