536 
‘¢ ¢ John Delamare, of Herbertstown, was living in 1354, 
whose eldest son, William, died before his father, leaving a 
son, 
‘© < John Delamare, of Herbertstown, who succeeded his 
grandfather, and was living 11 Richard II., 1387. 
‘© ¢ Herbert Delamare, of Herbertstown, was living 1419, 
and was father of two sons,—Meyler, who left ason, Herbert, 
who left a son, Herbert, who died 10th November, 1580, with- 
out issue ;—and Walter, who was father of Theobald, whose 
son, Walter, succeeded to the estate on the death of Herbert, 
and died 1613, and was succeeded by his grandson, Richard, 
who was twenty-six years of age, in 1613.’ ” 
A note by the Rev. Charles Graves was read, “ on the 
Solution of linear differential Equations, and other Equations 
of the same kind, by the Separation of Symbols.” 
Mr. Graves gives two distinct developments, which furnish 
solutions of the linear differential equations of the nth order. 
The terms of one of these developments are obtained by suc- 
cessive quadratures ; and the solution so arrived at is the gene- 
ral solution of the proposed equation, containing » arbitrary 
constants. 
All the terms of the other development are obtained by 
mere differentiation ; but the solution itself is only a particu- 
lar integral. 
The solution of the linear differential equation of the se- 
cond order may be obtained in a sufficiently simple form by 
this method, which applies itself with peculiar facility to the 
treatment of equations of differences. 
Rev. George Salmon read a note ‘‘ on the Generation of 
Surfaces of the Second Degree.” 
«« Mr. Ingram having, at a late Meeting of the Academy, 
alluded to a mode of generating surfaces of the second degree 
which I obtained a few years ago, I wish to state the method 
! 
