140 NATURALISTS’ ASSISTANT. 
absolute alcohol; then placed the tissues in I per. cent solution of picro- 
carminate from four to twelve hours. They were next shaken in dis- 
tilled water to remove the picric acid and placed in glycerine and water 
which is gradually replaced by pure glycerine containing I per cent. 
of formic acid. By this proces the nuclei are stained bright red, the 
rest of the cell being uncolored. 
Goadby’s solution for preserving specimens. 
No. 1. Bay salt 4 OZ. 
Alum 2 OZ. 
Corrosive sublimate 2 grs. 
Rain water I qt. 
No. 2. Salt. 4 |b. 
White arsenic 20 ers. 
Corrosive sublimate 2 grs. 
Boiling rain-water I qt. 
Arsenical soap. 
BECCEURS. 
Camphor 5 OZ. 
White arsenic 2 lbs. 
White soap. 2 lbs. 
Salts of tartar 1202. 
Powdered chalk 4 OZ. 
The soap is melted with a little water over the fire, and the chalk and 
tartar added. It is then removed from the fire and the arsenic, and 
lastly the camphor mixed with a little alcohol is stirred in. 
is then packed in jars and labelled. 
Arsenical soap. 
SWAINSON’S. 
White arsenic I 02. 
White soap I 02. 
Carbonate of potash I dr. 
Distilled water 6 dr. 
Camphor 2 dr. 
This composition is formed in cakes like ordinary soap. 
The paste 
