193 WEST, ON THE MICROSCOPE. 
free from grease. Let him place everything he may require close at hand, 
or within his reach. A stock of clean slides and covers must always be 
ready for use. He must keep his needles, scissors, and scalpels serupu- 
lously clean. An ingenious youth will readily construct for himself a box 
to contain all his tools. Cleanliness is so essential to success, that too 
much stress cannot be laid upon it. All fluids should be filtered and kept 
in well-corked phials. A bell-glass, which may be purchased for a few 
pence, will be found exceedingly useful in covering an object when any 
delay takes place in the mounting. For want. of it many specimens have 
been spoilt by the intrusion of particles of dust, soot, and other foreign 
substances. Let the table on which the operator is at work be steady, and 
placed in a good light, and, if possible, in a room free from intrusion.” 
From these extracts and the known excellence of Mr. 
West as a delineator of microscopic objects, our readers will 
be able to form a judgment of the merits of this little 
introduction to the use of the microscope. 
