Transparent Paper for Artists. 233 



genating and calorific ravs ; and of the other, by a similar 

 union between the disoxygeiiating and colorific. 



Evidence is then adduced, to disprove the present sup- 

 position of the mutual repulsion of the homogeneous par- 

 ticles of electricity, and the mutual attraction of the hetero* 

 geneous; and the true laws that govern both fluids investi- 

 gated. The laws proposed arc as follow : -.^^ 



1. That in a free and unconfined state, at an indeter- 

 minate distance, there is a mutual attraction between any 

 tw ■> volumes of electricity, whather of similar or different 

 species. 



2. That in the same free state, at a minute distance, all 

 panicles of electricity attract similar particles, and repel 

 those of an opposite nature*. 



3. That when contained in other bodies, an opposite 

 effect takes place ; and such bodies as are similarly electri- 

 fied repel each other, and those which are differently elec- 

 trified attract each other. 



The phaenomena of the Galvanic trough and Leyden 

 phial are then explained, in reference to the proposed hy- 

 pothesis ; and such evidence as could be collected, is 

 brought forward to prove that positive electricity is com- 

 posed of the disoxygenating and colorific rays ; and nega- 

 tive, of the disoxygenating and calorific. This is followed 

 bv a disquisition, whether it may not be either the colorific 

 ray, or the calorific, and not the disoxygenating, which 

 should be considered the base of both liuids. And the 

 whole concludes with a consideration of the philosophical 

 inquiries likely to arise out of the proposed hypothesis, if ' 

 on due investigation it should be found worthy of adoption. 



XXXVI. Intelligence and Miscellaneous Articles. 



TKANSPARENT PAPER FOR ARTISTS. 



JL HE tracing paper commonly used is apt to turn yellow, 

 which injures its transparency and utility. The following 

 recipe by Mr. Cathery, of Mead Row, near the Asylum, 

 for a tvhite transparent paper, appears in the xxxth volume 

 of the Society for the Encouragement of Arts, See. just 

 published. The longer time this paper is made, the better 

 11 is J it keeps clear and white, and can be traced upon with 



• It it necessary to state that the existence of the first position of this 

 leconil law iiad occurred to Mr. Donov.in, hs well as to the author of the 

 memoir, witho\it any conimuiiication between them on the bubject ; and 

 was enlarged on by him in a paper read to the Kirwaniaa Society before 

 Mr. C. became a niurabcr. 



a pen. 



