££: $2 4 
only, awhen placed in .the fun 3 
which obfervation ferved me as 
a ‘good index, whether thofe plants 
“Ww hich have experienced nearly the 
, fame influence of the fun as the ~ 
aes ‘matter, were. fit,to yield de- 
phiogifticated air, . The more brifk 
you fee. thefe . bubbles rife, the 
ur plants will, give theirs. 
manner of _judging can 
| = OF vie} in the morning 5 
for in the middle -of the day .all 
leaves of plants, even thofe’. which 
were»kept in a. very dark place, re- 
vive fo quickly, that they feem not 
to ftand fhort in.an;obfervable, way 
with thofe which. were. ay 
in the SPER: alls, 
