Vegetable Staticks. 39 



u to which fucceeded a moderate warmth. 

 " Frozen concave clouds therefore, by their 

 le great refle&ions, produce a vigorous hear, 

 " and the fame when refoived exceffive 

 u cold. 



Whence we fee that blafts may be occa- 

 fioned by the refle&ions of the clouds, as 

 well as by the above mentioned refraftion 

 of denfe tranfparent vapors. 



July 21. I obferved that at that feafon 

 the top of the Sunflower being tender, and 

 the flower near beginning to blow , that if 

 the Sun rife clear the flower faces towards 

 the Eaft, and the Sun continuing to (hine, 

 at noon, it faces to the South, and at 6 in 

 the evening to the Weft : And this not 

 by turning round with the Sun, but by nu- 

 tation; the caufe of which is, that the fide 

 of the ftem next the Sun perfpiring moft, it 

 fhrinks, and this plant perfpires much. 



I have obferved the fame in the tops of 

 J erufalem- artichokes and of garden -beans 

 in very hot Sun-fhine. 



Experiment X„ 



July 27. I fixed an Apple -branch m> 3 

 D 4 feet 



