. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 472 KEroitT—1884. i (this is not to be confused with Volta's summation or scries law, which is only applicable to metala), viz., that the total of a closed circnit of any number of substances may be reckoned by adding up tlie Volta forces observed electrostatically for every pair of substances in contact. This law is, it scorns to nie, for reasons given later (7),
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 472 KEroitT—1884. i (this is not to be confused with Volta's summation or scries law, which is only applicable to metala), viz., that the total of a closed circnit of any number of substances may be reckoned by adding up tlie Volta forces observed electrostatically for every pair of substances in contact. This law is, it scorns to nie, for reasons given later (7), very probable theoretically, but still it was quite essential to have it experimentally established, esjiecially as they point out that it is often called in question. FUr. .-J.—Ihid view of Ayrluu ami J'eriy's A|iijuratus. without good ground. The establishment of this law is, I say, porlinps their main work in this matter, besides the observation of the Volta ctTect for various difficiilt substances, especially liquids and liquids, Clifton arrives at the same conclusion with regard to summation, ami gives handy diagrams, reproduced in ' Jcnkin's Electricity,' of the contact. force at the diilercnt junctions. ]\[y own opinion is that the intemlwl and obvious signilicancc of those diagrams is theoretically wronsr, b'lt they embody certain experirauntal results conveniently, and tlicy can be interpreted ])roperly. Both Clifton and Ayrton and Perry appear to believe in tlic ^rtut constancy of the value Zn/Cu. Clifton gives it as y'tlG VoU. ('Qiu'lK' precision ! ' somewhat sarcastically ejaculates Pellat, who himself liiuls it to vary between '03 and -92). Ayrton and Perry assert that it is mow constant than a Daniel!. I believe that both Professor Clifton and I'ni- fessors Ayrton and Perry have made several experiments besides tliosi' recorded in their communications to the Itoyal Society, but as they liavu not been published I can give no account of them. Among the Theses
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