Bauhaus-Universität Weimar

bave pointed out the particularßimuli applied to the lèverai organs, 
and exciting them into action ; we have further fhewn, that thefe 
ßimuli can only produce their effeCts by the influence which 
they have upon the mind or fentient principle. But how does the 
mind put the mufcles into motion ; what is the material caufe in 
the brain, nerves, and mufcular fibres, which it employs as its in¬ 
finiment for this purpofe ; what is the intimate ftruCture of a mu¬ 
fcular fibre, or the precife manner in which the nervous influence 
adls upon it, when it produces its contraction ? Thefe are quellions 
which we have wholely avoided, being perfuaded, that whatever 
has been hitherto faid on thefe fubjeCts, is merely fpeculative; and 
that to offer any new conjectures on matters fo much involved in 
darknefs, and where we have neither experiments nor natural ap¬ 
pearances to fupport us, is to load with a new burden a fcience al¬ 
ready labouring under too many hypothefes. 
To finifh our account of the fpontaneous motions, it now only 
remains, that we inquire into the reafbns why the vital motions 
continue in time of fleep, and why the mufcles, or a few of their 
fibres, are often obferved to move for fome time after death or their 
fieparation from the body. 
Of the re of on vuhy the vital motions continue in time of fleep. 
THE reafon why the vital organs are continually agitated 
with alternate contrariions while the other mufcles of invo¬ 
luntary motion are contracted on certain occaflons only, will ap- 
pear from what has been already offered ; for we have feen that the 
former are always expofed to the aCtion of ßimuli, the latter only 
at particular times. But fince, during fleep, the organs of fenfe 
become lefs fit for receiving the impreffion of external objects, and 
the voluntary mufcles are* in fome meafure* relaxed and remain in¬ 


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