226 Mr. Lane’s Experiments on 
Th'efe fix were feparately taken out of the lixivium and put 
into a mortar, and rubbed or broken, and then carefully re- 
turned to their feparate phials before the fecond addition of 
lixivium, in order to forward the folution. 
Specimens defcribed. 
N° i . The external part of a laminated calculus, of a light 
yellowifh brown colour 
N° 2. The external part of a calculus, in colour like dirty 
tobacco-pipe clay f . 
N° 3. A light-brown laminated calculus. 
N° 4, and 5. Two fpecimens from one calculus ; of which 
N° 4. is the external coat, of a dirty tobacco-pipe-clay colour. 
N° 5. The internal part of N° 4.,. yellowifh like N° 1. 
N° 6. A calculus taken out of the urethra ; a greyifh white, 
inclining to yellow, of a porous texture. 
N° 7. A calculus about the fize of a nutmeg, taken from a 
child of a year old, given me by the late Mr. Pott ; afh- 
coloured, in waves of different (hades, laminated and hard. 
N° 8. A dark-brown very hard calculus, of the mulberry kind- 
N° 9. and 10. Two fpecimens from one calculus; of which 
N° 9. is the external whiti(h part, which appeared like a coat 
of calcareous- earth, covering an irregular mulberry calculus j. 
* The nucleus, fo called, being the central part, was of a much deeper 
colour, and had been found not fo foluble in lixivium as the light-brown part. 
f The nucleus was of a bright yellow, and more foluble in lixivium than the 
whitifh part. 
J The covering of this calculus induced me to fufpe& that lime or lime-water 
might have been taken, and, by being decompounded by frefh urine, containing 
fixed air, form this covering. Other calculi have afforded the fame fufpicions. 
In future, an account of medicines taken might afford much information, 
joined with the examination of different parts of large calculi taken out of the 
bladder. 
N° 10. 
