COLLECTION OF OBJECTS OF NATURAL HISTORY. 
407 
perpendicular lines from the same points to 
the picture-sheet, b c ; after this, draw from 
a point c, (which is beyond the lines drawn 
from the place of the points in the ground 
plan to the picture-sheet,) the line ce, parallel 
to the top or bottom edge of the drawing- 
board. Then from the point c, where the 
lines b c and e c meet, with a pair of pencil 
bows draw circles to ec, from all points in 
h e, where the perpendicular lines, and the 
lines drawn to the eye from the points in the 
ground plan, meet it; also the point where a 
perpendicular let fall from the point d, to the 
picture-sheet meets it, must be transferred 
by means of the pencil bows to the line ec/ 
and perpendicular to e c, from this last point 
transferred, mark off the point/, at the same 
distance from e c, that d is from h c. It will 
now be evident, that transferring the points 
be to ee, and setting the point /, in the 
position mentioned above, produces the same 
effect, as if be, with all the points on it, 
together with d, the point of sight, moved 
with the same angular motion round the 
point c, as a centre, till » c came to the posi- 
tion e c. The point d would then coincide with 
/, and e c would be the picture-sheet with all 
its points upon it, brought into a position 
parallel to the bottom of the drawing-board. 
When the operation is thus far gone, through, 
the rest of the process is conducted, as if the 
ground plan had been drawm to suit the pic- 
ture-sheet in the position e c. In order that 
fig. 4 may be fully understood, I need only 
add, that h is an elevation of the object a in 
the ground plan, and k is the perspective 
view of it : g in the perspective view being 
the position of the eye, or the vanishing point 
of the lines running perpendicular to the pic- 
ture-sheet. Rather than draw a perspective 
view with the position of the picture-sheet in 
the ground plan inclined to the sides of the 
drawing-board, as in fig. 4, it will be better 
to shift the blade of the drawing square, so as 
to draw the ground plan of the objects at the 
required angle to the picture-sheet, when it 
is in a position as in fig. 1. 
13. When a figure in the objects to be re- 
presented is parallel to the transparent plane 
theperspective of the figures is similar to the 
original one, but less in magnitude according 
to its discance. J W. 
THE 
S T U J) OF S C I E N C E, 
A FAMILIAR INTRODUCTION 
TO THE 
PRINCIPLES OF NATURAL PHILOSOPHY. 
As, among our readers, there may he some who have not had opportuniile.s of heroming 
acquainted with the recent elaborate researches and ingenious speculations of learned men 
In the several departments of Natural Philosophy, we have determined to devote a certain 
number of pages monthly, to form a series of le tures in the several branches of science, by 
way of a familiar introducttou to the study of Naturtil Philosophy with inoderu discoveries. 
THE TAXIDEHMIST; 
OR THE 
ART OF COLLECTING, 
PREPARING, AND PRESERVING 
OBJECTS 
OF 
NATURAL HISTORY. 
The advantages to be derived ‘from a col- 
lection of objects of Natural History, are too 
apparent to require any illustration ; and 
their beauty and variety of their forms have, 
in a preserved state, ever attracted the ad- 
miration of mankind, as being next in point 
of interest to the living animals. Although 
