QUESTIONS 215 



CHAPTER XIV 



How fast do Leptinotarsa decemlineata multiply ? When does 

 the egg-laying time come ? Describe the process. How many eggs 

 are laid in close succession ? What is the entire number laid by one 

 beetle ? Why do the eggs have to be laid in separate sets ? How 

 many days are there between the laying of two successive sets ? 

 When do the larvae begin to eat green things ? How many days are 

 required to turn a newly hatched larva into a full-grown beetle ready 

 to lay eggs of its own ? Where did Dr. Tower carry on his experi- 

 ments ? What did he already know about the starting point of every 

 kind of beetle ? What did he propose to find out about germ 

 cells ? In studying the matter of color, how many beetles did 

 Dr. Tower secure ? Where did they come from ? When they 

 reached Chicago, where did he put them ? What about the tem- 

 perature of each breeding place ? During what years did Dr. Tower 

 carry on his investigations ? After eleven years what had he found 

 out about the effect of heat and of cold on the color of the spots 

 and stripes of the beetles ? What did these experiments prove ? 

 What calamity overtook the beetles ? Before they had been killed 

 by the heat, what other experiments did Dr. Tower carry on ? 

 What did he suspect about germ cells being influenced by their 

 environment? How many pairs of beetles did he choose in 1902 ? 

 What did he do with them ? How many eggs did they lay ? What 

 did he call this set ? What did he do with those six beetles and all 

 their eggs after that ? How many additional eggs did these same 

 beetles lay ? What was this set called ? What happened to many 

 of the eggs and many of the larvae of both Lot A and Lot B ? 

 How many full-grown beetles were produced by lots A and B? 

 (See footnote.) What was the scientific name of the parents of 

 these beetles? Where had they been brought from in the first 

 place ? When beetles of this species are frightened, what do they do ? 

 When another species, called Leptinotarsa melanothorax, is frightened, 

 what does it do ? What was it that surprised Dr. Tower about this 

 lot of beetles ? What had the damp-heat environment done to them 

 even before they had been laid as eggs ? From the scientific point 

 of view, what was the most notable part of Dr. Tower's work ? 



