390 Scientific Intelligence. [Nov. 



whole day. When inspissated sufficiently, the residuum, which 

 we denominate extract, is taken out for use, which, if it has 

 become too stiff, may be easily brought to a proper consistence 

 by gently warming it, and kneading it with sufficient water." 







%he rfia 71 1> - Zotie r. 





A. Iron still, or evaporating pan. 



B. Water-bath. 



C. Steam-pipe to heat this bath. 



D. Thermometer indicating the internal temperature. 



E. One of the. covers in which is a glass aperture. 

 r. Pipe leading from the still to the receiver. 



G. Mercurial column to measure the degree of exhaustion. 

 H. Stop-cock. 



I. Cock for admission of air. 

 K. Receiver in the refrigerating vessel. 

 L. Cock for drawing oft' the condensed water. 

 M. Cock for admitting steam when the air is to be expelled. 



(Med. Chirurg. Trans, vol. x. p. 230.) 



XVI. Cow-Pox in Persia. 





Extract of a letter from William Bruce, Esq. resident at Bushire, 

 to William Erskine, Esq. of Bombay, dated Bushire, March 

 26, 1813, communicating the discovery of a disease in Persia, 

 contracted by such as milk the cattle and sheep, and which is 

 a preventive of the small-pox. «, 



MY DEAR SIR, 

 "When I was in Bombay I mentioned to you that the cow- 

 pox was well known in Persia by the Eliaats, or wandering 

 tribes : since my return here, I have made very particular inqui- 

 ries on tins subject amongst several different tribes who visit this 

 place in the winter to sell the produce of their flocks, such as 



