660 
The Philippine Journal of Science 
way as to leave one of the atoms saturated and the other with 
two unsatisfied bonds; and ( b ) that in a certain type of reaction 
an atomic shell momentarily contains two more electrons than 
its normal number. 
3. The two main types of double bond reactions have been 
illustrated. 
4. The applications of this theory will form the subject of a 
series of papers. 
