APPENDIX. 385 



less and under the influence of the anaesthetic, take 

 it up in a cloth, hold the hind legs between the 

 third and fourth fingers, and with the fore-finger 

 press down the head. Cut transversely through the 

 skin a little behind the skull with a pair of scissors, 

 carrying the incision only a short way on either side 

 of the median line; make a slight incision also 

 through the skin in the median line. The end of 

 the occipital bone can then be easily made out; it is 

 just above the level of the anterior edges of the 

 scapulae. With a sharp scalpel cut through the 

 muscles just behind the occipital bone and as nearly 

 as possible in the median line, so as not to cut the 

 vertebral arteries; the spinal cord will be exposed. 

 Thrust then a blunt stout needle into the brain and 

 move it about until the brain is quite destroyed. 



The following rough table may be useful to the student. 



1 litre = 1 cubic decimetre = 1 pints nearly. 



1 minim = '059 cubic centimetres. 



Ipint =0-57 litres. 



1 gallon =4 '54 litres. 



1 fluid ounce = ^\ pint. 



1 sq. inch = 6-45 sq. centimetres. 



1 cubic inch = 16-39 cubic centimetres. 



1 gram = 15-43 grains. 



1 kilogram = 35-27 oz. Avoird. = 2'21bs 



1 grain =0-065 gram. 



1 drachm =3-88 gram. 



1 oz. Troy =31-1 gram. 



1 oz. Avoird. =28-35 gram. 



1 Ib. Avoird. = 0-45 kilogram. 



1 centimetre = inch. 



1 metre = 1 yard 3 inches. 



1 inch = 2*54 centimetres. 



1 foot =3-05 decimetres. 



lyard =0'91 metre. 



TT^J- inch = & millimetre about. 



=12-7/x. 



=10-16^. 



25 



