£)6cfrim.9 riffeSling Heal or Caloric. 1 19 



A lew hours after eating thereof, you will frequently fee 

 iome of them running about as if drunk, or paralytic, but 

 eventually they generally all retire to their haunts and die. 

 As rats are extremely iagacious, it may be proper, where 

 they have only eaten a fmall portion, to allow the mixture to 

 remain for forty-eight hours. It will be beft to burn what 

 is left after that time, as a frefli mixture may be prepared at 

 a trifling expenfe, when wanted. 



During the time in which the mixture of barvtes is ex- 

 pofed to the rats, it is neceffary to keep (hut the doors of the 

 places where it is laid, to prevent the vermin from being 

 difturbed, or a poflibility of accident to any other animal or 

 perfon; for though it is not fo extremely dangerous, if taken 

 internally, as the preparations commonly employed for kill- 

 ing rats, and is even in fome cafes ufed in medicine, yet it 

 is fatal if taken improperly. 



The oil of anifeeds renders the mixture difasrreeable to 

 do<rs and many other -animals, but is, in fmall quantities, 

 alluring to rats. 



The carbonat of barytes may be procured in large quan- 

 tities at the lead mines belonging to Sir Frank Standi fh, 

 Bart, at Analczark, near Chorley : the proper fort is taile- 

 lefc, femi-tranfparent, and cflervefces with acids : it is mo- 

 derately hard and ftriated. It is frequently called aerated 

 barvtes [terra fbnderofa aerata), and fomctimes, by the 

 miners, ponderous fpar. 



V. A brief Examin itlon of the received Duclrhies rcfpetling 

 ILat or Caloric. By Alkxanueh Tilloch. Read 

 before the AJkeJian Society, December 1799. 

 [Continued from Page 78.] 



A 



Quantity of heat ridded to that already in water of 

 a known temperature, which &\o\\ fenjibly increafe the volume 

 of the compound, heat and water, only one tboufandtb part, 

 xifenjible heat; caloric not in combination, not in chemical 

 union — it is cognifable by our fenfes ! But if enough be 

 added /enjibl . . ■ afe tie volume to one tboufand time; 



