Report of Committee. 
95 
the first eye-piece shows nearly the whole of four squares, or 
the whole of one square, and a part greater or less of eight 
others, it is scarcely possible with only moderate care that an 
observation should be so inaccurate as that an object whose 
position has been registered should not be brought into the 
field of that glass. If sufficient attention be paid in ascer- 
taining and recording the position of the object, it may almost 
' as surely be placed in the field of an ^th or a 
In registering the position of an object as determined by 
these scales, a somewhat difi'erent plan from that already 
described may be and is adopted by some. Thus, taking 
advantage of the clear determination of the centres of both 
scales, with a view to reduce the counting to a minimum, the 
reckoning may proceed from the centre in all directions. The 
horizontal lines may be counted from the centre upwards and 
downwards for latitude ; the vertical ones too may be counted 
from the centre right and left for longitude. On this plan 
the latitude of an object registered on the previous plan as 
45, would be registered 10 below the centre. If it were 25 
on the first plan, according to this one it would be 10 above 
the central line ; this line being taken to represent the equator, 
the terms north and south may be used with reference to it. 
In like manner east and west may be used in reference to 
longitude, to signify the position of a vertical line right or 
left^of the central one. 
The manner of registering the observations will make no 
difference in the result, and is a mere matter of detail which 
every individual may settle for himself. The only important 
things are that both the observation and registration be 
accurate. 
Report of the Committee appointed by the Microscopical 
Society for the purpose of ascertaining the most convenient 
form of ¥mj)i:n for indicating the position o/ Objects under 
the Microscope. 
(Read June 25th, 1856.) 
An apparatus for registering the position of any number 
of minute objects contained in a slide, and for readily finding 
any one of them, either under the same microscope, or any 
other, has for some time been a desideratum with observers ; 
and various plans have been proposed. The Council of the 
Microscopical Society have therefore thought fit to appoint a 
Committee to consider the subject, and to suggest some means 
