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## Henry Bushby Transcription pages

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57

*y*+ (M2×n)-(1+2B).

But in the case of [S?]

_{z}with 1

_{z}, a

ring is formed by joining 1+2, and

not where z=2. This apparent

exception is met by applying the

2nd part of the rule.

B=

^{C}/

_{n-1}, ∴ 2B=

^{2C}/

_{n-1}

Hence the Rule of Rings may be

stated thus:-

[Blue vertical line crossed out down to end of paragraph] A ring is formed when any

part numbered

__^__~~x~~

*y*is joined to

any other part the number of

which =

__^__~~x~~

*+(M2×n)-1, or to*

__y__any other part the number of which

=

__^__~~x~~

*+(M2×n)-(1+*

__y__^{2C}/

_{n-1}), and

for

^{2C}/

_{n-1}may be substituted 2B.

Therefore in forming i.ks. with 1z

it is necessary to set out all the

parts existing comprehended in this double

formula as prohibited joins.