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. i. Bay salt 4 oz. 



Alum 2 oz. 



Corrosive sublimate 2 grs. 

 , Rain water I qt. 



No. 2. Salt. h lb. 



White arsenic 20 grs. 



Corrosive sublimate 2 grs. 



Boiling rain-water I qt. 

 Arsenical soap. 



BECOEURS. 



Camphor 5 oz. 



White arsenic 2lbs. 



White soap. 2 Ibs. 



Salts of tartar 12 oz. 



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. The paste 

 is then packed in jars and labelled. 



Arsenical soap. 



SWAINSON'S. 



White arsenic I oz. 



White soap I oz. 



Carbonate of potash I dr. 



Distilled water 6 dr. 



Camphor 2 dr. 

 This composition is formed in cakes like ordinary soap. * 



