of Edinburgh , Session 1878 - 79 . 
231 
(3) 
s- 
O’- 
er 
1 
1 
(4) 
8 
S 
°8 
1 
1 
(5) 
cr— 
cr 
s- 
s 
1 
1 
(6) 
cr- 
cr 
s d 
(0 
1 
1 
1 
o'- 
cr- = 
cr- 
er 
cr 
(T 
(8) 
1 
1 
1 
o’- 
er 
^8 
(Art. 24) 
55 
Subscript letters are to be understood. If in the case of 1 or 7 the 
subscript letters are the same, then 
A = B 
26. To prove that 8 ^ = 0 . 
Let A = s-B; 
cr 
that is, let A be the son of a male who is the mother of the 
male B. 
But this is impossible in the case of the human species, where sex 
is monoecious. Hence A is imaginary ; and therefore 
0 = s 1 ?, , 
cr 
whoever B is. 
27. The different permutations of the four fundamental symbols 
used directly and inversely may be exhibited in a table. I append 
one-fourth part of the complete table, marking the expressions 
which are impossible or which denote coincidence. 
ss 
Scr 
sd = 0 
sS = 0 
1 
1 
1 
1 
8~ 
S 
8 1 0 
cr 
s d 
© 
II 
|CO 
OD 
1 
] 
1 
1 . 
-8= 1 
— cr 
-d = 0 
C 
II 
1 
8 
s 
s 
S 
1 1 
1 1 A 
1 1 
1 1 
— — 
= 0 
8 d 
8 8 
S S 
VOL X. 
S O’ 
