50 



For d=l, 



Trans. Acad. Sci. of St. Louis. 



Table 20. 



B. Or again, instead of Table 6 we may write 



(e) 1 1 + d l + 2d 1+Sd 



(f) 1 2 + d 3 + 3d 4 + 6d 



(g) 1 3 + d 6 + 4d 10+lOd 

 (h) 1 4 + d 10 + 5d 20+15d 



Table 21. 



where ^Z is any integer. It will be seen that in tliis set 

 of series, also, the n*^ term of any series is equal to the 



