APPENDIX, 



Containing the alterations which have been introduced into the 

 London Pharmacopoeia of 1836. According to the edition of the 

 Pharmacopoeia Londinensis of 1836, the values of the liquid 

 measures have all been changed, and are at present as follow : — 





Eight Pints O viii. 



Twenty fluid oz. f ^xx. 



Contains^ Eight fluid drachms f5viii. 



Sixty minims nilx. 



Aconitina. Aconitine. — Take of the root of aconite, dried and 

 pounded, two pounds ; rectified spirit three gallons, dilute sul- 

 phuric acid, solution of ammonia, purified animal charcoal, of 

 each a sufficient quantity ; boil the aconite with a gallon of the 

 spirit for an hour m a retort to which a receiver is annexed ; pour 

 off the liquor, and what remains again boil with another gallon 

 of the spirit and the recently-distilled spirit, and pour off this 

 liquor. Let the same thing be done a third time. Then express 

 the aconite; and all the liquors being mixed and strained, let the 

 spirit distil : evaporate what remains to the proper consistence of 

 an extract. Dissolve this in water, and filter. Evaporate tflfe 

 liquor by a gentle heat, so that it may accjuirc a consistence not 

 unlike syrup. To this add of dilute sulphuric acid mixed with 

 distilled water, a sufficient quantity to dissolve the aconitine. 

 Lastly, drop into it the solution of ammonia, and dissolve the pre- 

 cipitated aconitine in dilute sulphuric acid, mixed with water as 

 before. Then add the animal cnarcoal, occasionally shaking the 

 vessel every quarter of an hour. Then strain, and again drop- 

 ping in the solution of ammonia, in order to throw down the aco- 

 nitine, wash and dry. 



