VOL. XL.] I'HILOSOPHICAL TRANSACTIONS. 263 



this inconveniency is also removed, without any way affecting the horizontal 

 level. 



The first trimming or preparing the tubes with mercury is sufficient, and 

 when the two little convex surfaces of the mercury appear just visible above the 

 level rings Ee, then is the instrument correctly trimmed ; if they appear much 

 above or below the rings, move the tubes a little up or down, till the surfaces 

 are adjusted to the rings ; which is effected by means of the regulating screw 1, 

 fixed at the end of the base tube. 



To observe by the sun, was described in the former article ; but to observe 

 by a star, another person must look, through the slit on the horizon vane, and 

 over the upper edge of the shade vane, and bring the star to coincide with it, 

 proceeding in the same manner as before, with the sun. 



An Account of the Extirpation of part of the Spleen of a Man. By Mr. John 

 Ferguson, Surgeon. N°451, p. 425. 



On the 5th of January, Mr. F. was called to Thos. Conway, who had re- 

 ceived a wound with a great knife, which went through the muscular part of his 

 fore-arm, and into the left hypochondrium. It was 24 hours after he had re- 

 ceived the wound before Mr. F. saw him. He found the spleen out at the 

 wound, and that what by pressing and thrusting of it with the fingers, endea- 

 vouring to return it into its place, which they that were about him could not 

 accomplish, and by being so long exposed to the air, it was quite cold, black 

 and mortified. He considered that cutting away the mortified part, must be 

 attended with the greatest danger, and was to him, an unprecedented case ; 

 yet that the patient must inevitably die, if it was not done : he therefore made 

 a ligature with a strong waxed thread, above the unsound part, and cut off 3| 

 oz. of the spleen : notwithstanding the ligature, there was a pretty large artery 

 that sprung with great violence, which he immedately tied up ; and, after bath- 

 ing all the parts with warm wine, he returned the remaining part of the spleen 

 into its place, leaving the ends of the threads out of the wound, to draw them 

 away by, when they should digest off, which they did on the 10th day, and 

 came away with the dressings. 



He dressed the wound with digestives, and the abdomen was stuped twice a 

 day with an emollient fomentation ; and after stuping, it was always malaxated 

 with an emollient liniment, which the patient said always gave him ease. What 

 he most complained of, was that he could not make water, for which Mr. F. 

 every day gave him a carminative clyster, which kept his belly from swelling ; 

 and always when the clyster came away, he got some water made along with it: 



