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Scientific American Supplement, No. 598, June 18, 1887 by Various
page 110 of 124 (88%)
Mother Bottard, a good, intelligent, and devoted woman, who is well known
to all those present.

"The auditors have arranged themselves at the students' tables, some seated
on the chairs and stools which furnish the room, and others standing, but
all following closely the teaching of the master, and at the same time
watching the _subject_. The picture is full of life and motion, and yet is
very exact. The head and shoulders of the subject are beautifully and
correctly drawn. The artist has brought together many men who are well
known in literature and science."--_Le Monde Illustre_.

* * * * *

[NATURE.]




TO FIND THE DAY OF THE WEEK FOR ANY GIVEN DATE.


Having hit upon the following method of mentally computing the day of the
week for any given date, I send it you in the hope that it may interest
some of your readers. I am not a rapid computer myself, and as I find my
average time for doing any such question is about 20 seconds, I have little
doubt that a rapid computer would not need 15.

Take the given date in 4 portions, viz., the number of centuries, the
number of years over, the month, the day of the month.

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