IV 



PREFACE. 



Rodriguez; Dr. Wm. Roxburgh; Sir H. Davy, F. R. S. &C.5 

 Hon. H, Grey Bennet, Esq. ; Mr. Tollard, Sen. 



The Engravings consist of : 1. Sections of Plants to shew 

 the manner of the Buds in the Stalks, by Mrs. Agnes Ibbet- 

 son. 2. The secret and open Nectaries of Flowers, by the 

 same. 3. An Apparatus by Messrs. Kerby and Merrick, 

 for measuring the sonoriferous vibrations of the Gases. 

 4. A Compensation Pendulum, by R, B. 5. An economi- 

 cal Lamp. 6. New disposition of Musical Keys, by J. 

 Trotter, Esq. 7. The Growth and Increase of Trees, by 

 Mrs. Ibbetson. 8. An Apparatus for manufacturing Prus- 

 sian blue. 9. Designs to illustrate the Structure of the 

 Roots of Trees, by Mrs. Ibbetson. 



