Diagrams for n Terms. 



269 



conclusions may be drawn, such as A, B, and D being all 

 true, E, F, and G are also true; A being true when B and G 

 are both false, H is true, &c. 



m iHHHi mwm 



III 1 - 1 ^ 1—H 



M ■ hi in 



The second part of the conclusion calls for the three combi- 

 nations marked 8 to 10 on the diagram. These are 

 A b c d e¥ gB. 



A b c D ef g"R. 



Hence from either B C D/ or b c D e or b c d e we may con- 

 clude AegH. 



Attention may be drawn to the fact that these diagrams 

 differ from those suggested by Mr. Venn in having a compart- 

 ment for the absence of all the characters or objects. Thus in 

 the 8-term diagram the compartment marked with a star 

 stands for the combination abed efg h. This compartment 

 may need to be shaded out, and hence should be indicated on 

 a complete logical diagram. This is parenthetically acknow- 



