166 



man, it was necessary by giving it an cxtensire stir- 

 face, to provide for a plentiful perspiration, since it 

 has no other way of discharging superfluities as a 

 man has. It was necessary likewise that, the plant 

 should imbibe a larger quantity of fresh fluid than the 

 man, because the tiuid filtrated through its roots dors 

 ftot contain so many nutntiv e particles, as the chyle 

 which enters our veins. 



But there is a la:itude of perspiration both in men 

 and pi ints. In this flower it varied from sixteen to 

 eighteen ounces during twelve hours day, as it was 

 watered less or more, in a healthy man it varies from 

 a pound and a half to three pounds. 



Evcr-'^neis' perspire far less than other plants. In 

 proportion they neid less^nourishment ; hereby they 

 are better able to bear the winter ; like insects, which 

 as they perspire Jitiie, li\e the whole winter without 

 food. 



In order to try whether any sap rose in winter, 

 he ma 'e various experiments, from all which it ap- 

 pcared. it does rise then also, but in small quanti- 

 ties. And hence v*e see why an ever-green grafted on 

 an oak will remain verdant, when the oak leaves 

 drop. Perspiring less, it needs less nourishment than 

 the oak, and so is sufficiently fed by the sap that rises 

 even in winter. 



In summer, when hot sun-shine follows a shower, 

 the vines in the middle of a hop -ground, are often 

 all scoichi'd up, almost from one end of a large ground 

 to the ether: at the same time the tapuiirs ascend 

 plentifully. The scorching of the virus seems to be 

 caused by these scorching vapours, which ascend 

 most in the middle of the ground, the air there being 

 more dense, and consequently hotter than on the 



The white clonds 3 likewise, which appear in summer* 

 time, occasion a vehement heat, by reflecting many 

 of the solar rays, which otherwise would not touch 

 the casth. And if the sun be on one side, and the 

 clouds on the other, they are perfect burning glasses* 



