5M^ eN THE INTERIOR OP PLANTS. 



very useful here, if secured by oiled leathers, at each extre- 

 mity of the connecting tube. 



As the pump is entirely made of brass, and has no wood- 

 work ; it is very strong, and will no doubt last a long time. 



I am, Sir, 

 Your constant reader, 



L. O. C. 

 Query on cen- P. S. I beg leave to propose the following query, respects 

 tion^ ""*" ''^S professor Wood's new theory of the diurnal motion gf 

 the Earth. As the effect of the centrifugal foice is, to cause 

 a body to fly off from the circumference in the direction of 

 the tangent ; when ar.y other force coincides with this, will 

 it not be increased ? and when any other force acts in a di- 

 rection opposite to it, will it not be diminished? Accord- 

 ingly, I have frequently obiierved, that the dirt, which 

 flies off from the upper semicircle of a carriage-wheel, when 

 moving rapidly, has a greater velocity, than that which flies 

 off from the lower semicircle. 



I am aware, that a part of this velocity may be accounted 

 for in a different manner; but, I believe, the whole of it 

 cannot. 



III. 



On the Interior of Plants, Letter I. Bi/ Mrs. Agnes 

 [bbetson. 



To Mr. NICHOLSON. 

 SIR, 



opinions. 



« , VV HEN first 1 began to dissect plants, something more 



should aTJid than twelve years ago, that I might not involuntarily imbibe 

 preconceived .^j^y system, or feel ihe least prejudice for any particular 

 mode of thinking, but leave nature to write her fair history 

 on my mind, and tix her various appearances in strong cha- 

 racters on my memory, I avoided with the greatest care 

 all books of physiology; and it wat not till many years after 

 I had dissected and seen much of the course she pursues, 

 and habituated myi;elf to her forms and delineations, that 



I ventured 



