TABLE OF CONTENTS 



TO THIS THIRD VOLUME. 



APRIL 1799. 



E 



NGRAVINGS of the following Objcfts : i , A Pocket Ribband Machine for 

 charging a fmall coated Phial with Electricity; and, 2. Apparatus for obtain- 

 ing an invariable Meafure from Experiinents with a Pendulum. 



I. A ftatical Enquiry into the Source of Nutrition in fucculent Vegetables. By 

 Mr. J. Gough. - - - - page i 



Succulent plants have been fuppofed to derive much of their nutriment by abforption from the air; 

 but it may be queftioned. whether they do not merely fubfift for a long time without any fupply, 

 when furrounded by dry air only. Statical experiments to determine this point. Uniform refult, 

 that the fucculent vegetables of Europe are nouriflied by the common vehicle of water, either con- 

 veyed to them by the earth, or depofucd on their leaves, in the form of rain. 



II. Defcription of a Pocket Ribband Machine for charging a fmall coated Phial 

 with Electricity. By J. Fell, Ulverftone. - - p. 4 



An endlefs web of varnithed ribband is drawn by the hand between two boards faced with mole-lkin, 

 and pafTed in the eleflrified ftate in contaft with a wire of a coated jar, which, by that means, be- 

 comes charged. 



III. Of the Corundum-ftone from Alia. By the Right Hon. Charles Greville, 

 F.R.S. - - - - - p. 5 



Scientific obfervations on the cryftalline forms of corundum. Table of the fpecific gravities of the 

 corundum, fapphire, topaz, ruby, and diamond, from different authorities. 



IV. Experimental Refearchesconcerning the Principle of the lateral Communica- 

 tion of Motion in Fluids, applied to the Explanation of various hydraulic Phe- 

 nomena. By Cit. J. B. Venturi, Profeflbr of Experimental Philofophy at 

 Modena, Member of the Italian Society, of the Inftitute of Bologna, th<; 

 Agrarian Society of Turin, &c. - - - P- *3 



Vol. III.—March 1800. b ' Hollow 



