VI 
CONTENTS. 
XXVI. An Account of fame new Experiments on the Production 
of artificial Cold. In a Letter from Thomas Beddoes, 
M. D. to Sir Jofeph Banks, Bart . P. R. S. p. 28 2 
XX VII. An Account of a Doubler cj Electricity , or a Machine 
by which the leaf conceivable Quantity of pofitive or negative 
Electricity may be continually doubled , till it becomes perceptible 
by common Electrometers , or vijible in Sparks. By the Rev. 
/ 
Abraham Benner, M. A. ; communicated by the Rev. Richard 
Kaye, LL.D. F. R. S. p. 2S8 
XX VIII. Some Particulars relative to the Production of Borax. 
In a Ectter from William Blane, Ffq. to Gilbert Blane, 
■ M. D F. R . S. \ p. 297 
XXIX. A Letter from the Father Prefect of the Mifionin Thi- 
bet, F. Jofeph da Rovato, containing fome Obfervations rela- 
tive to Borax. Communicated by Sir Jofeph Banks, Bart . 
P. R . S. p. ,30 1 
XXX. Sur les Gas Hepatiques: par Monfieur Haflelifrate. 
Communicated by Sir Jofeph Banks, Bart. P. R. S. p. 305 
XXXI. Botanical Defcription oj the Benjamin Tree of Sumatra. 
By Jonas Dryander, M. A. Libr. R. S. and Member of' the 
Royal Academy of Sciences at Stockholm j communicated by Sir 
Jofeph Banks, Bart. P. R. S. p. 307 
XXXI 3 . An Account of an Experiment on Heat. By George 
Fordyce, M. D. F . R. S. In a Letter to Sir Jofeph Banks, 
Bart. P. R. S. p. 3 1 o 
XXX III. Account of an Qbfervation of the Right Afcenfon and 
Declination of Mercury out of the Meridian , near his greatef 
Elongation , Sept. 1786, made by Mr. John Smeaton, F. R. S. 
with an Equatorial Micrometer, of his own Invention and 
JVorkmanJhip ; accompanied with an lnvefigation of a Method 
of allowing for Refraclion in Juch Kind of Obfervations ; com- 
7 municated 
