10 
THE YOUNG SCIENTIST. 
your hand. Rest your hand on your hip, or 
take hold of the edge of your coat. When you 
want the card to rise, turn the right side of 
your body very slightly, away from the goblet, 
which will, of course, pull the hair, and the 
card will come up. 
As soon as it is fairly out of the pack, take it 
with your left hand and give it to the person 
who holds the goblet ; beg him to examine it, 
and whilst his attention is engaged with it, 
you take the goblet and pass to the one whose 
card is next to come up. As your hair is now a 
trifle longer, you stand a little further off" from 
liim than from the first, but in 
every other respect you do the 
same as before. And so you 
go on until all the cards have 
arisen. 
The object of fastening the 
end of the hair to a cent, is to 
save feeling for it, which you 
would otherwise have to do, as 
it is impossible to see it when 
lying on the table. 
There need be no fear of the 
audience discovering the hair, 
as I have performed the trick 
very many times in a brilliant- 
ly lighted hall, and never been 
detected. You cannot, however, 
use the torn card when exhibit- 
ing the trick in this way. 
There remains but one thing more to explain 
in connection with this trick, and that is : how 
to make the audience draw the particular cards 
you want them to, so that they may correspond 
with those in the prepared pack. It is as easy 
as any part of the trick, but as the limits of 
my lesson are already reached, I shall have 
to defer that explanation until next month. 
Every reader of this journal has heard of the 
carrier pigeon, and knows that it is employed 
to carry messages from one place to another, 
but all are not aware, perhaps, that pigeons 
cannot be made to carry a message away from 
home ; they can be used only for sending mes- 
sages back from some place to which they have 
been carried from their own dove-cotes. Now 
during the siege of Paris it was easy for those 
who were confined in that city to escape by 
means of balloons, but it was impossible for 
those who were outside to get into the city. 
To convey information to the inhabitants. 
The Microscope in War. 
A T first sight it seems strange that the micro- 
scope should find any direct employment in 
the conduct of warlike operations, but when we 
recollect the great importance of dispatches to 
the defenders of a besieged city and to their 
friends outside, there is no longer room for 
wonder. It was probably during the siege of 
Paris that the microscope was brought most 
extensively into use as an aid in transmitting 
intelligence. 
Carrier Pigeon with Micro-Photograph. 
those who escaped by balloons took with them 
carrier-pigeons, and these pigeons conveyed 
back the required information in the form of 
letters. That these letters might occupy as 
small a space as possible, they were first 
printed in large sheets, and these sheets were 
then photographed, but on so small a scale 
that the letters were utterly invisible to the 
naked eye. Indeed so small were they that a 
copy of a twenty-four page New York Sunday 
Herald might have been easily packed in a 
crow quill. These photographs were then 
rolled up, enclosed in a quill, and fastened tO' 
the bird in the manner shown in the engrav- 
ing. When the bird reached its former home 
in Paris it was caught, the quill removed, and 
the photograph read by means of a good mi- 
croscope. 
The Social Science Association of Boston 
publishes the startling, if true, statement that 
several mills in New England are grinding^ 
white stone into powder, to be used in adul- 
terating sugar, soda, and flour. 
