562 ESSAYS AND OBSERVATIONS 



I cannot better explain than by the 

 following letter to me from Mr Hall. 



*' Sir, James Tod continued as I de- 

 " fcribed in my kft, till your letter came 

 ** concerning the mercury. 



•* Immediately we fet about giving it a 

 " trial, and accordingly rubbed on two 

 " drams of quictfilver, intimately killed 

 " with axunge, the firfl night ; and next 

 " morning the fame quantity : Next night 

 " and morning again, the fame quantity ^ 

 " and fo on, till we had rubbed in twenty 

 " drams of quickfilver. We confined the 

 ** und\ion principally to his legs, from 

 " a fuppofition of the caufe lying there. 

 ** All the while, the falivation was never 

 ** brifk : He only felt a little forenefs in 

 *' his mouth, and fpit a little more than 

 " when in health. It operated, however, 

 " fsnfibly by urine, and by fweat } and 

 " never went off by ftool. Befides the 

 *' quantity of mercury above mention- 

 " ed, another half ounce was rubbed 

 " in at twice, with two days interval 

 ** between the times; and two days after 

 *' he had finifhed the former quantity, 



"The 



