THE PRESERVATION OF SEA FISH 
89 
CONCERNING THE PRESERVATION OF SEA FISH BY 
A FORMALIN AND SODA SOLUTION, COMMONLY 
REFERRED TO AS 4 JORES’ SOLUTION ’ 
By R. J. Cuninghame 
I believe I am correct in stating that what is known as 
4 Jores’ ’ preservative solution has been but seldom employed 
for the preservation of sea fish weighing upwards of half a 
pound to ten or fifteen pounds, and as I am at present com- 
pleting the preparation of a large collection of sea fishes made 
at Mombasa, British East Africa, the following remarks and 
observations may be found useful to others contemplating 
the employment of this chemical solution. 
The formula for 4 Jores’ ’ solution, and comments thereon, 
may be found in 4 The Principles of Pathological Histology,’ 
by H. R. Gaylord, M.D., and Ludwig Aschoff, M.D., and I 
quote the more essential information concerning the action 
of the formula. 
On page 45 will be found Section VIII, on methods for the 
preservation of the natural colours of the tissues, and the 
following extract has been made : 
4 It is occasionally desirable to preserve the colour in micro- 
scopic specimens for future reference. . . . The tissue is 
hardened in Formaline to which are added various salts, and 
in this it takes on a grayish appearance. After being suffi- 
ciently hardened, the necessary time depending on the size 
of the preparation and its consistence, the specimen is trans- 
ferred to weak alcohol, in which it recovers its original colour, 
when it is transferred to a preserving fluid in which it is kept. 
Preparations which have been kept in the preserving fluid for 
a period of time, and have lost their colour, may be restored by 
returning them to alcohol. . . . 
4 Plenty of fixing solution should be employed and the 
preparation must be placed in the position it should occupy 
after hardening. . . . 
4 The length of time required for fixation in the case of small 
