EiuiATA TN Prof. Kirkwood's Article. 



Page 106, erase the comma at the end of 1. 2 from top. 



" " 1. 10 from top, for 489,000,000, read 480,000,000. 

 Page 111, 1. 16 from bottom, for period read periods. 

 Page 112, 1. 7 from 1)ottom, for n' read ii^. 



