580 PHILOSOPHICAL TRANSACTIONS. [aNNO 1722. 



there were left 2 drachms of resinous extract; the remains of the bark dried 

 weighed 1 oz. 2-|- drs. the loss this way is 3^ drs. 



I boiled these remains in several waters till they would no longer tinge the 

 water; which being evaporated, yielded 14- drs. of extracts; the remains of 

 this dried, weighed 1 oz. and -^ dr.; the loss by this method is half a drachm. 



I took 2 oz. more of picked bark, and boiled it in several waters, till the 

 bark gave no more colour; and then by evaporating of the water, had 2 drs. 

 of extract. The remains being dried, weighed 1 oz. 6 drs.; here the loss was 

 not any thing, except so much as might answer in weight to the quantity of 

 the menstruum left in the extract, which allowance must likewise be made in 

 the other extracts. 



I digested the remains in rectified spirit of wine till they no longer tinged 

 the spirit, and by a very gentle evaporation, I found remaining 1 dr. of resinous 

 extract. What was left, when dried, weighed 1 oz. 2 drs. in this the loss was 

 24- drs. 



The difference in the quantity of extract, obtained by these two different 

 methods, is only half a drachm ; and the medium between them, on putting 

 together the several extracts made with spirit of wine and water, is in the whole 

 only 3-^ drs. But the extract made with spirit of wine alone, is no more 

 than 2 drs. from 2 oz. of the cortex, instead of 10 drs. which it ought to 

 have yielded according to Mons. Boulduc. 



u4n Account of the new Method of Cutting for the Stone. By J. Douglas, 



Surgeon, F.R.S. N^ 371, p. 83. 



After making some experiments on dead bodies, I was convinced that the 

 stone might be extracted the high way, with much less trouble than com- 

 monly ; and I was persuaded that the wound would heal again, by the great 

 number of authentic instances we have of accidental wounds in the same place 

 being speedily and firmly cured. I therefore resolved to make the experiment 

 on the first patient I could meet with, which I could not procure till Dec. 1719, 

 and then I proceeded as follows : 



The patient was placed flat on his back, on a table, with a pillow under 

 his head ; then his wrists and ancles were fastened together with straps. I 

 then ordered one assistant to his head, another to each of his shoulders, two 

 to the penis, one of which was to manage the ligature, and the other the 

 prepuce, and one to each knee, to hold them as fast and firm as possible. The 

 patient and assistants being thus placed, the operation consists of three parts. 



1st. In filling the bladder, which is done thus: pass the catheter; then draw 



