8 E. L. De Forest—Law of Error in Turget-Shooting. 
The actual value of ¢,* falls far within the probable amount, and that 
of ¢,° does not so much exceed the probable one as to make us confi- 
dent that it is anything more than accidental. But if both the ine- 
qualities were taken into account, we should have 
a, = 29," ¢,°= "30832 b,=p,’= 33203 (28) 
a, = 29,7 6,°="88934 b= p,7= 474-24 
and the equation of the surface will be of the same form as in 
formula (34) of my article in the Zransactions. The sub-index of 
the first 6, should fall inside the bracket, instead of outside as there 
printed. 
