tube surrounding the stem, the temperature of the latter must 
have been considerably higher. Direct observation proved this 
to be the case: a thermometer introduced into the metallic case 
of the stems submitted to experiment, must have posse a 
temperature notably higher than the exterior parts: and yet, the 
Structures around the pith were found congealed. Moreover, @ 
degree of cold equal to zero of Fahrenheit is quite moderate in 
comparison with the natural cold endured by the very plants 0B 
whic the experiments were performed. And secondly, that 
