276 
In conclusion it is my most pleasant duty to express my dee- 
pest gratitude to Prof. Rutherford for suggesting these investiga- 
tions, for his kindness in the advice he has so freely given to me 
and for placing at my disposal all the plentiful resources of his 
laboratory at MeGill University. 
MeGill University, Physie Buildung. 
Nakladem Akademii Umiejetnosci, 
Pod redakcya 
Czlonka delegowanego Wydzialu matem.-przyr., Dra Leona Marchlewskiego. 
Kraköw, 1905. — Drukarnia Uniwersytetu Jagiellonskiego, pod zarzadem J. Filipowskiego. 
3 Maja 1905. 
