18l2j On, Nav. Det. 267 
19, F(2) 4-/(2) ^ 2/(i^).F(f ^ _ 2; 
<20 , (a) V2 ./(i ? — X) , 
22 , 1 — /Ce) 2/(tC? - e))* 
26, E(4)- ^ F{z - e) . F(2 + *) , 
33* 
