'34 



MUSCLES, NERVES, BRAIN. 



Sect. VII. 3. 



\ 



eorrefponds with the abforptioa of the ailment, and the circulation of 

 the blood in animals ; which Phjfiologifts have demonftrated to de- 

 pend oil the mufcular motions of the veflels themfelves, which pof- 



fefs 



bility, and are excited 



fluids, which they acqu 

 The irritability of ve 



6lioa by the fl 



of the 



to 



fTcls is flievvn by 



pen 



ment of Von Uflar, who palTed ftrong dearie (hocks through a plan 

 of euphorbia, fo as to deftroy the life of the plant ; and he then ob 

 ferved on cutting off a branch, that it did not bleed ; though a fimila 

 branch cut off before the death ( 



f th 



/ 



ant effufed much milky 

 juice; whence he juftly concludes, that the eledric percuffion had 

 deftroyed the irritability of the plant. 



Mr. Cavallo aflerts In his Treatife on Ekaricity, that he found by 



peated experimen 



the plant balfam (impatiens) wasdeftroy 



ed by lefs quantities of ekaricity than any other vegetables, which 



h 



fubjeaed to it ; and th 



on 



pa 



ng the plant afterwards n 

 of it could be difcovered 



injury on the external or internal 



whence it may be concluded that the irritability fimply, and 



fiini 



of the plant, was deftroyed by the unnatural quantity of 



I, that not only fliocks from fo fmall a coated fur- 



He add 



face as fix or eight fquare inches, but even ftrong fparks from a large 

 eondudor deftroyed thefe plants, which fometimes recovered in a day 

 or two, but not frequen^^y. See Sed. XIII. 3. and Sea. XIV. 2. 3. 

 of this work. 



The afcent of the fap-juice during the vernal months in the ex- 

 periments both of Hales and Walker, bein^ retarded or quite flopped 

 during the cold parts of the day, and in the night ; and on the north 



fide of the tree in cool days, when it continued to flow on the fouth 

 fide. 



can 



ly be afcribed to the 



ty of the vegetable veflel 



dccreafed by the deficient film 



further treated of in Sed. XIV 



IS of heat, 

 of this work 



See this 





a 



3. The fenfi bility of fibres is diflinguifhed from their irritability 



5^^ 



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ail 



d 



w 



h< 



h^ 







leaf 

 rlun 



Jeaf 



orii 

 ap; 



ill ■ 

 hur 



leal 

 tog 



de- 



an 



C2 



cl 



in. 

 rit 

 mi 



of 



ft] 



fc 



V 



c 



.tl 



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