142 
AMEEIOAlsr AGEIOULTUEIST, 
[March. 
AN 
UNSEEN 
WORLD 
Revealed to Every Eye. 
The unaided eye sees but vcrrj little of the uni¬ 
verse. The telescope brings to our knowledge vast 
numbers of worlds the existence of which we 
should have had no conception, without its aid. 
JThere is also all around us a world invisible to our 
patural eyes; and only by using the Microscope 
can we see and study its wonderful inhabitants. 
By this we find that there are myriads of things 
hidden from us by their minuteness—indeed thou¬ 
sands, if not millions, for every one that is visible. 
We find that there are animal forms that move, 
feed, multiply,,and apparently enjoy themselves, 
yet so small that millions of them gathered in a 
space as large as a silver dollar, would each have 
abundant room to sport and play ! [See next page.] 
Not only are there minute forms of animal life, 
but there are innumerable plants so small that no 
one is aware of their existence until it is revealed 
by the Microscope. These Little Things are not 
only Interesting, but to see and know them is of 
Oreiit Sin|>oi-ta.nce to Us. 
The greatest harm to our Crops, our Animals, 
our Fruits, our Flowers, even to our Bodies, is 
found to be due to living things, both vegetable 
and animal, so small that they have until recently 
escaped our knowledge. 
l>o Uoit Witist to See some of these 
small but wonderfully interesting things ? We are 
now prepared to help every reader of the American 
Agriculturist to some conception of them, to help 
look a little way down into this unseen world. 
T'he Aiiiei’ica.it Ag-rieulturist 
Comi>ound Microscope. 
This was specially devised for the readers of the 
American Agriculturist ; it is partially described 
on the following page. This instrument will 
enable one to examine, and to see very distinctly 
and clearly, a vast multitude of interesting things, 
each one a thousand times smaller than the tiniest 
thing that you can sec with the unassisted eyes. 
This instrument, as you will learn from the de¬ 
scription, is accessible to all our readers, either 
without cost, or at a cost far below anything like 
it was ever before offered—at a cost so small 
that if you knew how valuable it is, you would 
spare no sacrifice or effort to get it immediately. 
Not a Uimiily, not a 'rcacSicr, not a 
l!$chool, in all the land, should be without one. 
It would be of more interest to all, and to most 
people more useful, than anything else they could 
buy for many times the cost. 
and WalliiEag-. 
The adage has it, “ we must creep before we can 
walk.” That is not quite true in t/iis case. While 
every one may begin with a Simple Microscope 
and go on to a Compound one, the Compound Mi¬ 
croscope we have above referred to, is so construct¬ 
ed, .and its use so fully explained in the descriptions 
and directions accompanying each instrument, that 
the merest novice, or even a child, can very quick¬ 
ly learn to use it with unbounded interest and satis¬ 
faction. But while we advise all to look into the 
value and importance of the Compound Micro¬ 
scope and examine its great capabilities, we have 
A NEW AND 
Most Interesting Unnouneement 
TO EVJERT REARER 
OP THE 
American Agriculturist, 
AND TO THEIR ERIENDS. 
The Publishers have the great pleasure of an¬ 
nouncing that they have within the past month 
succeeded in having made expressly for them a 
new and inosiit v:iliiiEl»le Simple Mi¬ 
croscope, which is pronounced by experts, by 
the highest scientific authorities in such matters, 
to be the most complete, most perfect, and most 
useful instrument of the kind ever devised in this 
or any other country, that can be produced and 
supplied for anything like the low cost of this one. 
Anti IScttei*. 
By special arrangement to have them manufac¬ 
tured on a large scale, with automatic machinery, 
(which not only secures eMtirc uniformity in quality 
and a perfection far beyond former methods,but re- 
Fig. 3.— MICROSCOPE READY FOR USE. 
duces the cost to a small fraction of the former 
hand manufacture), these most useful instruments 
are now brought within the easy reach of every 
man, woman, and child. Our arrangements will 
enable us to speedily provide 
ONE FOR 
Evei*y 
TO THE 
American Agriculturist. 
Safely packed for carriage and deliv¬ 
ered free to any part of the United States 
or Territories. . [|?|t SpA".] 
WESCKIU'I'IONf.—The American Agricul¬ 
turist IVEW Simple Mici-ustcope is shotifn 
in fig. 1, ready for packing in its box, while fig.- 3 
shows the lenses raised and ready for use. The stand 
or body is of nickel-plated metal (resembling silver 
and untarnishablo). It stands upon a broad bottom. 
An opening on one side admits light within to a 
Mii'i'or, fig. 3 ; this concentrates 
and throws the light up to the object examined. 
This Mirror is so suspended that it can be turned to 
any angle required by the incoming light from a 
window, or from a lamp at night. This Mirror is 
of great importance, and is one of the very decided 
improvements upon the former Simple Microscope 
supplied seven years ago to our readers. By its aid 
the needed extra illumination of the object to be 
examined is provided. At the top of the stand is 
a ttlsiss set in a frame like a watch crys¬ 
tal.—Two nickel-plated iiipi'iiig' €llip!!>, fig. 4, 
over this stage, hold firmly upon it the slides that 
carry the objects to be examined.—The Micro¬ 
scope is also accompanied by two 
Platus or slides, and 
also, to bo placed be¬ 
tween them, a water¬ 
proof Hell for hold¬ 
ing seeds, insects, and 
other small objects 
and fluids. Xlie 
I,<*H!>>es, figs. 5 and 6, are of course the most im¬ 
portant thing in any microscope. In this instru¬ 
ment there are XIIRKK of them, of different 
powers, and so arranged that one can be used 
wiiere low power is required ; a second one for a 
little liigher power, and a third for a still higher 
power. Then again any two can be combined for 
other powers, and all tliree when the highest 
power of the instrument is desired. Thus seven 
different powers can be quickly provided, ranging 
from a magnifying power of seven diameters up to 
twenty-five or more. (It will be understood that if 
a lens magnifies twenty diameters, ^that is twenty 
times in one direction, it magnifies equally in all 
directions or twenty times twenty areas, or foui 
hundred times (less what is taken off from the cor¬ 
ners, in cutting a circle out of a square). A circu¬ 
lar area of twenty-five diameters is nearly five hun¬ 
dred times tliat of one diameter, and this (500) is the 
magnifying power of 
these three lenses 
used together.) They 
are of highest quality 
glass, and ground to 
perfeetion, of course 
by automatic ma¬ 
chinery so that there 
can be no variation 
of curvature.—They 
are as free as possi¬ 
ble in an instrument 
of this kind from the 
imperfections of or¬ 
dinary lenses, in fact j'jg 5 — lenses and 
nearly achromatic, a diaphragm, separate. 
point not even at¬ 
tempted in the great mass of cheap microscopes sold 
at moderate prices.—A (shown 
at the lower left-hand of tig. 5, and in fig. 6) is pro¬ 
vided to cutoff outside light in examining minute 
objects, and concentrate the vision upon a single 
point. This turns in or out as needed.—All the 
Lenses are attached (as in fig. 6) to a Sliding Rod 
fig. 7, which is moved up and down 
in a tube by the thumb-piece, making it thus easy 
to adjust the lenses to any desired distance from 
the object, and to suit them to different eyes. 
The whole apparatus is packed in a neat Box, 
Fig. 4.— SPRING CLIPS. 
