850 REPORT—1905. 
4, Differential Invariants of a Plane and of a Curve on a@ Plane. 
By Professor A. R. Forsytu, 7.2.8. 
5. Chess Magic Squares. By M. Casumore, I4.P.S. 
This paper described chess magic squares—that is, the magic squares having a 
constant summation along every chess path. The method of construction was given, 
followed by an investigation showing the number of possible chess magic squares. 
The paper closed with the theory of their construction. 
6. Computation of x. By M. Casumorz, M.P.S. 
This paper gave a better formula than Machin’s. The correct value of 7 was 
given to ten places by the use of three terms. 
7. Report of the Committee on Electrical Standards.—See Reports, p. 95. 
