re: Brodermund 1904 ref. cited by Rex.

You might want to check the date Ehret first mentioned his formula
(and I don't know what that date is). Ehret first wrote in the late
1800's and his formula MAY have predated Brodermund. I will let those
who can cite specific dates for Ehret's writings, settle this issue.

(To me it is not very interesting - whether he derived the formula
by himself, or copied it from Brodermund, Ehret was an extremist
who put dogma ahead of health, and (in my opinion) a lunatic as well.
I say that as a former Ehret follower.)

Tom Billings