1052 PROCEEDINGS OF SECTION I. 
No. 2.—SHORT DESCRIPTION OF A NEW METHOD OF 
PREPARING AND PRESERVING ANATOMICAL 
AND PATHOLOGICAL TISSUES, WITH SPECIAL 
REFERENCE TO THEIR COLOU R-PRESERVATION. 
By Sypney Jamieson, M.B., Edin., M.R.C.S., Eng. 
(Read Friday, January, 7, 1898.) 
[ Abstract. | 
NotuineG can possibly add more to the utility of museum prepara- 
tions, especially for purposes of teaching, than a method of pre- 
serving the natural colour of organs and tissues permanently. 
Hitherto it has been the custom to remove, as far as possible, 
the blood from the parts while fresh, and straightway preserve 
them in various strengths of alcohol. 
For some tissues this is all that is required, as the distinguishing 
features may thus be retained sufficiently well for purposes of 
demonstration. 
For instance, a valvular lesion of the heart, or a congenital 
malformation of an organ may, by this means, be preserved indefi- 
nitely, and still retain its distinctive freshness more or less 
unimpaired. 
Far otherwise, however, is it with the majority of pathological 
conditions. 
In many cases, within a comparatively short period of time, the 
appearance of the parts becomes so much altered that it ceases 
in any way to convey to the eye those characters by which the 
diseased process may be recognised, 
So much so is this the case, that until quite recently one would 
search in vain the shelves of a path ological museum for an adequate 
representation of so common and characteristic a condition as 
chronie venous congestion of the liver. 
By the use of a formula, the details of which T will now describe, 
it has now become possible to preserve such specimens in a condition 
almost identical with that which they had when first removed 
from the body. 
Organs, however, preserved in this way, still require a certain 
amount of care, in order that their natural colouring may be 
entirely retained. 
Exposure to direct sunlight for a lengthened period will in many 
cases remove, to some extent, the colour. 
