278 Transactions of the Society 



sections will then be found to be satisfactorily stained, although the 

 extreme peripheral portion may be rather deeper in colour. 



In conclusion, it is absolutely essential to use freshly-made 

 solutions. Solutions of carmalum and haematoxylin do not keep 

 longer than a month in the winter, and about half this time in the 

 summer, and the rate and quality of penetration depreciates with 

 the age of the solution. 



Any appearance of precipitation or fungoid growth may be 

 taken as a proof of deterioration. The hasmatoxylin solution keeps 

 somewhat longer than the carmalum, and does not precipitate, even 

 though kept for some length of time. 



To obtain the maximum keeping capacity, make up all stains 

 with distilled water that has been previously boiled and allowed 

 to cool. 



