76 DISSECTION (OF THE BRAT. 
Erlicki's* ligqued for a month or more, then wash then 
well in water and keep in 80% alcohol. One should be 
divided longitudinally by a cut through the great longtr- 
tudinal fissure and the corpus callosum, and the other 
should be divided into a serves of cross-sections, each 
about 4 wn. thick, from the antertor to the pos- 
tertor end of the brain. After having dissected an 
alcohol brain according to the following drrections the 
study of these cross and longitudinal sections well prove 
very instructive in giving the proper relations of the 
different parts to one another. 
A, TPE BICAIN MEACBIRALN ES, 
1. The Dura Mater will be exposed in removing the 
brain. It is the tough membrane lining the inside of 
the skull. It projects im between: the lobes of the 
cerebrum as a vertical fold, the falx ceredbrz, and as a 
transverse fold, the ¢exforzum, between the cerebrum 
and cerebellum. 
2. The Pia Mater is a much thinner membrane, 
closely investing the brain ; it is very vascular, since the 
blood-vessels supplying the brain are carried in it. 
* The composition of these liquids is as follows : 
MULLER’S LIQUID. 
WATER a chic A-side erates bee ercesronpoiele tole. e 100 parts 
PoOtassitim biGhtOmate -.nteerseteie se scle.< 2 parts 
Sodium Sal phates ey ismieuebicevete oe w)eis ates i pant. 
ERLICKI’S LIQUID. 
IWIAVET rvs SyPricte mice roams nite eee + « 1OO parts, 
Potassium DiCHTOmMAale winters suscyete ices oe 24 parts. 
Copper sulphate 72accke ia cick eile. meee 4 part. 
The brains should be immersed in a relatively large quantity of these 
liquids, and during the first week of the hardening the liquid should be 
changed either every day or every second day. The Erlicki’s liquid acts. 
more quickly and is probably the better one of the two to use. 
