■306 ESSAYS AI4D OBSERVATIONS 



and N° 14. 15. & 16. compared with 

 N** 17. 18. 19. & 20. 



'Tis true, that the fibres of the interco- 

 flals on the right fide of the fterniim of the 

 dog N° 22. continued to be agitated with a 

 tremulous motion confiderably longer than 

 the hearty and when the intercoftal mufcles 

 attached to the ribs were quite dead. But 

 did not this happen becaufe, after feparating 

 the fler?ium from the ribs, and thus cutting 

 off all communication between it and the 

 fpinal marrow, the mufcles attached to it, 

 could be no more affefted by the opium y 

 which had been injeded into the cavity of 

 the abdomen y while the heart and other muf- 

 cles whofe communication, by means of the 

 nerves, with the brain and fpinal marrow, 

 was intire, continued to be expofed to its 

 action ? 



(k) As Dr. Langrijh has obferved, that 

 the diftilled water of laurel-leaves injeded in- 

 to the cavity of the ahdomeriyM^h dogs fooner 

 than when it is taken into the ftomach * ; 

 foN°2i.and 23. compared with N° 22. 

 ftiew that opium injeded into the flomach and 



great 



* Phyfical experiments on brutes, p. 64. 



