EMENDATIONS. 
p. 2, line 7 from bottom .before sign of equality insert ( 
p. 10, line 5 from bottom, transpose Reed and Read, 
p. 10, line 2 from bottom, for "Reed" read Read. 
p. 11, line 1, for “Reed” read Read. 
p. 11, line 6, for "reed" read read; for "green, grene" read leef. 
p. 11, line 7, for "green" read leaf. 
p. 11, line 1 of table, for “Reed” read Read, 
p. 15, line 1, for “cephalotherax” read cephalothorax. 
p. 26, line 6 from bottom, for “the the” read the three, 
p. 28, second integration, in limits, for " x" read z. 
p. 28, eighth and ninth integrations, in upper limit, for “ x" 
read z. 
p. 33, in fourth formula, for “>” read <. 
p. 40, add the following note: 
GRAPHICAL APPLICATION, 
The application of the general equation (1) may be 
made graphically, by a method which may be briefly 
outlined as follows: 
Let a curve be drawn of which the ordinate at any 
point represents the total load from the head of the 
train up to that point. Prom the points A, B, C, 
D (Fig. 1, 2, 3, or 4) draw vertical lines, intersect¬ 
ing the curve in points a , b, c, and d respectively. 
Then whenever equation (1) is satisfied, the straight 
lines ab and cd (produced if necessary) intersect in 
a point lying on the vertical line through F. 
In a paper presented to the American Society of 
Civil Engineers (Transactions, Yol. XXII), Professor 
H. T. Eddy gave graphical constructions for deter¬ 
mining the position of the train for maximum stress 
