VOL. v.] PHILOSOPHICAL TRANSACTIONS. 561 



the hand. This done, I had these openings sowed up again; and then having 

 made the dog drink plenty of water, I left him for near three hours in the least 

 violent posture that his ligatures would permit. Afterwards having opened both 

 the holes, and the bladder being pressed with the hand, there issued out of it 

 a quantity of urine, and the ureters seemed to be a little swelled above the liga- 

 ture. This operation was made with great exactness ; but yet as it is of im- 

 portance for discovering the way of the urine, I would have repeated it often, 

 if I had not been obliged hastily to come away from the place where I then was, 

 and I am not at present at leisure to try it again. 



Of the abundance of IVood, found under Ground in Lincolnshire. 

 Communicated by a Friend, well acquainted with that Country. 

 N" 67, p- 2050. 



That fenny tract, called the Isle of Axholme, lying part in Lincolnshire and 

 part in Yorkshire, and extending a considerable way, has anciently been a 

 woody country, witness the abundance of oak, fir, and other trees, of late fre- 

 quently found in the moor, whereof some oaks are five yards in compass and 

 sixteen yards long ; others smaller and longer, with good quantities of acorns 

 near them, lying somewhat above three feet in depth, and near their roots, 

 which do still stand as they grew, viz. in firm earth below the moor. The 

 firs lie a foot or 18 inches deeper, more in number than the oak, and many of 

 them thirty yards long ; one of them being, not many years since, taken up of 

 36 yards long besides the top ; lying also near the root, which stood likewise 

 as it grew, having been burnt and not cut down as the oak had been also. 

 The number of these trees is reported by Mr. Dugdale, in his book on drain- 

 ing the Fens in England, to be so great, that the inhabitants have, for divers 

 years last past, taken up many cart loads in a year. 



Of the original overflowing of this woody level no account is given, that I 

 know of. Even Mr. Dugdale only says, that the depth of the moor evinces 

 that it has been so for divers hundreds of years, since that could not grow to 

 the thickness it is of, in a few ages. The cause thereof he concludes to have 

 been the muddiness of the constant tides, which, flowing up the Humber into 

 the Trent, left in time so much filth, as to obstruct the currents of the Idle, 

 Done, and other rivers, which thence flowed back, and overwhelmed that flat 

 country. 



