calculi: 335 



The meihorialist thinks it would be improper, in addres- Experiments] 

 sing so intelligent a body as the Society ef Arts, &c. to ex. ^Jjfj^^^'J^'^ 

 patiate on the various economical purposes to which the &c. 

 principle, which he has been able but imperfectly to unfold, 

 may be applied. In abler hands it may be found suscepti- 

 ble of improvement, which he cannot anticipate. 



NEIL SNODGRASS. 



IV. 



Expenme?ital Inquirij info the Nature of Gouty and Gra- 

 vellcy Concretions. By Thomas Egan, M. i). FRS*. 



JL HE urine of gravelly patients, when fresh rendered, 

 nay, after standing inany horrs, in a temperature of sixty 

 degrees, is relatively more acid than the healthy j sometimea 

 as much so as the gouty ; and frequently continues so, even 

 after depositing its gravelly matter. An exception to this, 

 however, sometimes occurs in goiity habits;, their urine 

 depositing copiously this acid substance, and yet manifest- 

 ing no increased, but sometimes rather decreased acescency ; 

 for, with them, a considerable diminution of the quantity 

 of the usually excreted super-acidulated phosphoric salt 

 often takes p^ace, as shall be fully explained upon another 

 occasion. 



Having premised these observations, it is now time to 

 consider what effects acid substances are productive of, 

 when mixed, out of the body, with this very complicated 

 liquor. And here, to prevent repetition, I will observe, 

 that that generally used, was rendered fresh in the morn- 

 ing, in the quantity of from three to four ounces, (unless 

 otherwise specified;) being that most easily retained at one 

 time in the bladder. The quantity of acid extremely 



Mr. William K-rr, for the Lochwinnoch Spinning Company, con- 

 i^T-rn the utility and success of Mr. Snodgrass's method, and attri- 

 bute to him the credit of first applying steam to the purpose of 

 heating manufactories. 



•"■ Extracted from a longer Memoir in the Irish Transactions, 



gm3.Il, 



