tiii C O N T E N t S. 



SUPPLEMENT TO VOL. XXX. 



Engravings of the folldwing Subjects, 1. Mr. Lester's, Machine for washing 

 Roots. 2. Mr. Salisburv's Method of packing and preserving Plants and 

 Trees. 3. The Shefiield"'Apparatus for cleaning Chimneys without the Aid of 

 Climbing-Boys. 



L On the Place of a Sonne], produced by a Musical String. In a Letter from 

 Mr. John Gough. ----• ... . 321 



IL Experiments and Observations on the different Modes in which Death is 

 produced by certain vegetable Poisons : by B. C. Brodie, Esq. F. R. S. Com- 

 municated by the Society for promoting the Knowledge of Animal Chemistry. 



324, 



III. Description of a Mashine fer washing Potatoes, and other esculent Roots 

 for feeding Catde: by Mr. William Lester, of Paddington. - 333 



Wy Method of packing Plants and Trees intended for Exportation, so>as to pre- 

 serve their vegetative Powers for many Months: by William SaUsbary, of the 

 Botanic Gardens at BrompLon and Sloane-Street. ... - 329 



V. Description of an Apparatus used at Sheffield for cleaning Chimneys : by 

 Mr. Samuel Roberts, Chairman of a Committee appointed at that Place for 

 encouraging the Sweeping of Chimneys withont the Use of Climbing- 

 boys. - . . . . - 349 



VL Abstract of a Paper on the bitter Substances formed by the Action of Nitric 

 Acid on Indigo: by Mr. Chevreul. - " %.." ■ ^51 



VIL Analysis of Hedge Hyssop, Gratiola Officinalis, of the Order Bignonia of 

 Jussieu : by Mr. Vauquelin. - - - - - 3G5 



VIII. On the Causes which influence the Direction of the Growth of Roots, 

 ^y T. A. Knight, Esq. F. R. S. In a Letter to the Right Hon. Sir Joseph 



Banks, Bart. K. B. P. R. S. - - - - - 370 



IX. On the mucilaginous State of Distilled Waters : by Mr. Bucholz. 379 



X. Anew Analysis of Ambergris: by Mr. Bucholz. - - - 381 



XI. Process for preparing Phosphoric Acid: by Mr. Martres, Apothecarv at 

 Montauban, and Member of several Societies. .... 333 



Index 



3S.$ 



INDEX 



