ON DRAWING. 6 



6. Fine dissections should be done under water, which sup- 

 ports the parts and greatly facilitates the operation. A stream' 

 of water allowed to play gently on the dissection from time to 

 time is often a valuable aid. 



7. The dissection of muscles, and still more of nerves, is 

 greatly aided by placing the specimens in spirit for a day 

 before dissecting:. 



8. Keep your instruments clean and sharp. Be careful not 

 to blunt your fine scissors or scalpel by using them for cutting 

 hard parts. 



9. If you get in a muddle, stop and w^ash the dissection 

 thoroughly under the tap before proceeding further. 



IV.-ON DRAWING. 



It is absolutely essential to draw your dissections, and this 

 must on no account be omitted. Keep a separate book for your 

 drawings, and draw every dissection you make. Do not be 

 discouraged if you find it difficult at first : you will never regret 

 time spent on it. 



The following rules will be useful to those w^ho have not 

 learnt drawing systematically : — 



1. Make your drawing to scale, i.e., either the exact size of 

 the natural object, or half or double or treble that size, as the 

 ■case may be. 



2. In commencing a drawing, first determine by careful 

 measurement the positions of the principal points, and sketch 

 in lightly the whole outline before finishing any one part. 



3. If the object you are drawing is bilaterally symmetrical, 

 draw a faint line down the middle of your paper, and sketch in 

 the left hand half first ; by measuring from your median line 

 it will be very easy to make the two halves symmetrical. 



4. Name on your drawing the several parts shown, and 

 mark also the scale adopted. If your drawing be of the 

 natural size mark it thus — x 1 ; if it be double the size of the 

 object mark it x 2 ; if half the size, x ^, and so on. 



5. Draw on one side of the page only : and write an explana- 

 tion of your drawing on the opposite page. 



6. Coloured pencils are very useful, and w^ater-colour paints 

 still better. Keep certain colours for particular organs or 

 tissues ; e.g., when drawing the skeleton colour the cartilage 



