en is lighted by two large windows
opening on one of the courts of the hospital. The Professor stands at the
right of the picture, his head uncovered, one hand close to his body and
the other extended slightly in a gesture which is familiar to him, his
audience being before him. At his side is Mr. Babinski, chief of the
clinic, supporting a person afflicted with hysteria. Near the latter stands
a nurse and assistant who watches every movement of the patient. This is
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.

Compute the following 4 items, adding each, when found, to the total of the
previous items. When an item or total exceeds 7, divide by 7, and keep the
remainder only.

_The Century Item_.--For old style (which ended September 2, 1752) subtract
from 18. For new style (which began September 14) divide by 4, take
overplus from 3, multiply remainder by 2.

_The Year Item_.--Add together the number of dozens, the overplus, and the
number of 4's in the overplus.

_The Month Item_.--If it begins or ends with a vowel, subtract the number
denoting its place in the year from 10. This, plus its number of days,
gives the item for the following month. The item for January is "0;" for
February or March (the 3d month), "3;" for December (the 12th month), "12."

_The Day Item_ is the day of the month.

The total