88 Medical Chemistry. 
acid 3 in eatarrhal affections, is to procure ee and to di- 
the frequency of the paroxysms of coughing. The 
next day, we find the pulse less quick and hard, and by de- 
grees the cough becomes less violent. I have not observed 
that it produces expectoration, but it —- or 
the cough, and renders it less laborious. The intestinal ca~ 
nal is gently excited, so that [ have rarely seaadl comgaaien 
to give purgatives a second time. By the moderate use of 
certain stimulants, we easily obviate the languor which 
sometimes in feeble and aged subjects, follows the use o 
the prussic acid ; and when the cough is alleviated, we can 
certainly remove the debility by the use of the ammoniacal 
tincture of iron, dissolved in brandy and water. 
Among the particular cases mentioned by Dr. ‘Thomson, 
are some sufliciently remarkable-—A man. of thirty-seven 
years of age, habitually very healthy, and of a plethoric 
habit, had been for several weeks tormented with a very 
wearing cough, which almost deprived. bim: of sleep; the 
paroxysms became constantly more more frequent ; 
his throat was much affected—he had a great hoarseness, 
with a short and wheezing after a cathartic, he 
respiration ; 
took the prussic acid every two hours—dose, two drops in 
twelve drachms of water. Immediately he gained sleep— 
his cough abated—expectoration became easy—the pulse 
grew soft, and in three days all the ew of the disease 
were sed. 
A lady, aged forty years, of a sanguine and inritabte tem- 
perament, and naturally gay, had been for two years labour- 
ing under the pthisis trachealis. Having the first year de- 
rived no benefit from medicine, she neglected the com- 
plaint the second year, and took medicines only when the — 
symptoms were aggravated. e disease was marked by 
a laborious cough—a perception of dryness in the throat, 
with danger of immediate suffocation, and a general inflam- 
mation and swelling of the back part of the mouth. These 
symptoms, accompanied by fever, and great irritability, 
never entirely ceased ; they diminished at intervals, e 
cially in summer, but returned with increased violence pith 
every exposure to cold. She was advised to quit England 
for warmer climates, but this was not executed. She 
worse—her pulse was small, quick, i ar, and varying 
with the state of her mind. She had pee noes and very 
