126 PREPARATION AND MOUNTING 



Ferrocyanide (yellow prussiate) of potash. ... 12 grains. 



Tincture of sesquichloride of iron 1 drachm. 



Water 4 ounces. 



Dissolve the ferrocyanide of potash in one ounce of the water ; 

 add the tincture of sesquichloride of iron to another ounce. Mix 

 these solutions gradually together, shaking the bottle well which 

 contains them it is best to add the iron to the potash solution. 

 When thoroughly mixed, these solutions should produce a dark- 

 blue mixture, -perfectly free from any perceptible masses or flocculi. 

 Next mix the naphtha and spirits of wine, and add the glycerine 

 and the remaining two ounces of water. This must now be slowly 

 mixed with the blue liquid, shaking the whole well in a large 

 bottle whilst the two come together. The tincture of sesquichlo- 

 ride of iron is recommended, because it can always be obtained of 

 a uniform strength. 



31. Dr. Turnbull used a mixture slightly different from the 

 above, which is made with the sulphate of iron : 



Purified sulphate of iron 10 grains. 



Ferrocyanide of potassium 32 grains. 



Glycerine 1 ounce. 



Pyroacetic acid 1| drachm. 



Alcohol 1 ounce. 



Water 4 ounces. 



Dissolve the sulphate of iron in one ounce of the water, gradually 

 add the ferrocyanide of potassium dissolved in another ounce, and 

 proceed as above. 



32. Dr. Beale also gives us the following carmine injection to 

 be employed in the same way as the blue.* Take 



Carmine 5 grains. 



Glycerine, with 8 or 10 drops of hydrochloric 



acid ^ ounce. 



* When, however, it is desirable to cut very thin sections of the injected 

 subject, the carmine is sometimes added to a solution of fine gelatine 

 gelatine one part to water eight parts. But the warm water and mode of 

 proceeding which are used with the size solutions before described will bo 

 necessary in this case also. 



