ig square room on the top floor of one of the college
buildings; and in this room is a bookcase extending from ceiling to
floor, given up to his own works.

Copies of every edition and of all translations are here.

And in a special case are the original manuscripts, solidly bound in
boards, as carefully preserved as were the "literary remains" of William
Morris, guarded with the instincts of a bibliophile.

Of the size of this Haeckel collection one can make a guess when it is
stated that the man has written and published over fifty different
books. These vary in size from simple lectures to volumes of a thousand
pages. His work entitled, "The Natural History of Creation," has been
translated into twelve languages, and has gone through fifteen editions
in Germany, and about half as many in England.

The last book issued by Professor Haeckel was that intensely interesting
essay, "The Riddle of the Universe," which was written in Eighteen
Hundred Ninety-nine, in two months' time, during his summer vacation. He
gave it out that he had gone to Italy, denied himself to all visitors
who knew that he had not, and answered no letters. He reached his study
every morning at six o'clock and locked himself in, and there he
remained until eight o'clock at night. At noon one of his children
brought him his lunch.

Unlike Herbert Spencer, whose later writings were all dictated--and very
slowly and painstakingly at that--Haeckel writes with his own hand, and
when the fit is on, he turns off manuscript at the rate of from two to
four thousand words a day. In writing "The Riddle of the Universe," he
took no exercise save to go up on the roof, breathing deeply and
pounding his chest, varying the pounding by reaching his arms above his
head and stretching. However, after a few weeks the villagers and
visitors got to looking for him with opera-glasses; and he ceased going
on the roof, taking his calisthenics at the open window.

This exercise of reaching and stretching until you lift yourself on
tiptoe, he goes out of his way to recommend in his book on
"Development," wherein he says, "There is a tendency as the years pass
for the internal organs to drop, but the individual who will daily go
through the motion of reaching for fruit on limbs of trees that are
above his head, standing on tiptoe and slowly stretching up and up,
occasionally throwing his head back and looking straight up, will of
necessity breathe deeply, exercise the di