Year: 1872

The large audience which filed the great hall OF
the Cooper Institute last evening OF the came
brilliant and eminently intellectual character as
those which have attended Professor Tyndall's
preceding lectures, and this, the third of the
course, proved Of special interest and was an un-
qualified success.


AS the seats filed rather slowly the lecturer did
not appear until about halfpast eight, and. while
waiting for his appearance, Mr.. Hewitt stepped on
the platform and remarked that In future the rule
In regard to the hour OF attendance would be
strictly enforced and those who should not have
arrived at eight O'Clock would be excluded and the
doors would be closed. Professor Tyndall would
be as prompt as would the audience.


Professor TYNDALL then came forward and
humorously dsclamed all the responsibility OF
what had Just been said. He was met by warm ap-
plause In appearance he is one Of those peculiar
men who are once in a while found making pc
cular progress in any peculiar path OF human
knowledge. He has the dry sort OF manner about
Of studies OF ascetlc science, and which arises IRON
the concentration OF mind upon subjective
head, which bears all the traits OF an lncisive ana
energetic intellect Is high and narrow like some
great castle with heavy battlements, full OF
mixture OF black and silver, and his
beard is still more. although but little,
whitened with years. His face is rather thin the
nose is very prominent and sharp, and his chin is
Short with lips not at all ideal In their character
His eyes are OF a cold gray color and keen In ex-
preston, and his brow rather notable for its
ruggedness of outline. His stature Is small and
his form unsymmetrical. His hands and his feet


black with a white cravat: At certain points in


his speech he would assume over the
desk an attitude which might have been
ludicrous IL were not that the
wonderful and intense interest inspired in his
auditors by his clear method OF explanation Of diff
1cult phenomena through which his strong intel
lectual originality shed sort of attractive light,
acting like the charm OF a magnet precluded the
cti n tan T. la rin tha
periments are given aloud, and at the quick sharp
note OF a small gong the gasights are frightened
the figures upon the white screen is electric, being
created by currents from tremendously powerful
batteries.


The lecture last evening continued the train OF
research in which, building part upon part, he
erects the fair temple or thought which Is the re-
suit of his studies and his propagation OF theories
in science, the truth Of which he attempts to prove
at each step OF his progress He first showed that
nsa 1 ns NY IN .ne mos. ini
tionaly as great as In the loadstone that would
cause revolutions OF the needle upon its axis. He
magnetized ladys stay and then broke ii several
times, and after each seperate breaking the frag.
ments possessed the same attractive and repellant
properties as did the whole Of the article origi-
nally.


Push this breaking in the Imagination to the
utmost limit, and the conception OF magnetism re-


siding in the ultimate particles OF the matter could
be formed. With such clear, inductive Illustration
the whole lecture was full The experiment OF the
selective self-arrangement OF magnetized iron
filings was very beautifully exhibited through the
lens upon the screen The lecturer paid high
compliment to Professor Mayar OF Hoboken, say.
| ing that the specimens of the curves formed by
7 the particles on the glass; which he had effected
were the most beautiful he had ever seen. and


that from this gentleman he yet expected 'con-
siderable things"


A really magnificent ana apparently super.
natural experiment was that OF the capitalization
OF chloride OF ammonium In the form OF astersks
But still more striking and beautiful was that in


which two wires OF platinum charged with opposite
currents OF electricity were immersed in a solution
OF acetate oil lead and water These were dis.
played invested by the powerful light given by the


batteries. Under the action OF the negative cur.


rent ramihcaons OF branches and leaves like those
In the vegetable world, would suddenly spring out
OF one OF the wires, ana the wonderful phenomena
would continue until the picture presented was
that OF beautiful hrm plant vividly DISPLAYED on
the snowy background. on the positive wire bub.
bles were formed and could be seen passing OF.
When the currents were reversed this, too
spronted and grew amazingly, and presented a
tangled network OF erratic foliage. The most i'm
portant illustrations which he gave however
were those which showed the truth OF
the theory OF the prolongation OF light
that ID, the refracti0n which produces
two reflections In the transmission OF the rays
These experiments were very exhaustive OF the
snbect, and startling effects OF color were produced
by the polarization OF light through crystals OF gyp
sum and tourYnaline. The last was rather
amusing. The Professor produced rose on the
canvas and turning the crystals round, changed
the coors to their opposite that the leaves were
OF red and the flower Of green. In the words OF
Lord DuDdreary, he remarked, "It was q pretty
nower, ifit were Of another color.


II was ten O'Clock when the audience reluctantly
separated, and yet the duration OF the lecture 80
full was 1t OF multiplicity Of pleasing and as.