DOC.

14 EINSTEIN

AND BESSO

MANUSCRIPT

387

[p. 13]

(Einstein)

[65][P. 12]

and

[p. 13] are on

two

sides

of

one

sheet.

[66]Most equations

on

[p. 13]

duplicate

material

on

[p.

1]

having

to

do

with

finding

the metric

field

of

a

static

sun

to first

order.

[Eqs.

91,

92, 93,

and

95] on [p.

13]

are equivalent

to

[eqs.

2, 4,

5,

and

3]

on [p. 1],

respectively.

The factor

c20

in

the

first

line of

[eq. 96]

clearly

should

be

1;

the

equation

then becomes identical

to

[eq.

6]

on [p. 1].

[67][Eq.

94]

is

the

Euler-Lagrange equation

for

a

point

mass

moving

slowly

in

a

static metric

field (see

[eq.

54]

on [p.

8]).

The

square

root

signs

abbreviate ds/dt

(see

[eq.

52]

on [p. 8]).

Comparison

of

[eq.

94]

with Newton's second

law

for

this

case

gives [eq.

95] (compare

this

quick

derivation of

the

relation between

K

and

K

with Besso's

attempts

on [p.

52]

to

derive this

relation;

see

note

242).

The form of

[eq.

94] directly

entails the "area law"

(see

[eq.

56]

on [p.

8]), as

is

shown

in

[eq. 97].

W

=

ds/dt

(see

[eq. 105] on

[p.

15]),

f

denotes the "area

velocity"

(see

[eq. 57] on [p. 8]).