TOXICOLOGY. 351 



pound and a half of powdered arsenious trioxide, stirred it 

 up in a tub of boiled linseed gruel. This was served out 

 equally to nine horses on their return from work at two 

 o'clock in the afternoon. Very shortly afterwards, viz., 

 about half an hour, the horses began to manifest consider- 

 able uneasiness, and the owner in consequence telegraphed 

 to Louth. AVhen Mr. Gresswell arrived he found that 

 eight of the horses had died ; but the ninth case, which 

 had an almost imperceptible pulse, recovered under careful 

 treatment. 



The time that had elapsed between the administration of 



the poison and the death of the animals varied from one 



hour and fifty-five minutes to two hours and thirty minutes. 



The horse which recovered remained very debilitated for 



many weeks afterwards. 



Each horse, it is believed, received from an ounce and a 

 half to two ounces of arsenious trioxide, partly in a state of 

 solution, partly in a state of mechanical suspension. 



We might record many other cases, but the above will 

 suffice to illustrate the main symptoms produced in the 

 horse by large doses of arsenic. 



We may now say a few words concerning chronic arsenical 

 poisoning in the horse. 



In February last we were called to see a valuable seven- 

 year-old hunter, belonging to a gentleman residing a short 

 distance from Louth. The horse had an excellent appetite, 

 but was in poor condition. On examination the pulse was 

 found to be fairly strong, but irregular, losing one beat in 

 every six. The respirations were somewhat accelerated. 

 We were informed that when galloped, even for a short 

 distance, the horse breathed laboriously, and could only 

 with difficulty be induced to go beyond a fair trot. 



It was ascertained that for many months previously the 

 late groom had given to the horse small doses of arsenic 



