X-RAY MOTION PICTURES 149 



there was no possibility of a successful result by con- 

 tinuing longer, so Peter and Paul came out of their 

 leaden houses and the final result was a return to 

 their University home where their useful little lives 

 were terminated by the use of chloroform. Fare you 

 well, Peter and Paul! 



Was it worth the effort? Yes, many times, yes. Any 

 work that may lead to our accumulated knowledge 

 is worth any amount of trouble. What one man 

 learns and gives to the world may be added to by 

 someone else and the result prove of great value to 

 many. 



If I have an opportunity to do the experiment 

 again, I will choose an animal with larger and more 

 porous bones, like a hen. The bones of a rat are very 

 small, about the size of the lead in your pencil. But 

 to keep an animal in one position for nearly a month 

 is a serious problem and not to be attempted with- 

 out much thought and complete preparation. 



Dr. Goodspeed and I now started a series of com- 

 parative experiments to test the effect of X-ray on 

 the prolonged life of flowers. The conditions were 

 controlled as much as possible in temperature and 

 other points, choosing flowers as nearly equal as pos- 

 sible. The two cameras were started and another 

 cluster was kept under normal conditions in the 

 same room. We first worked with the California 



