165 



derms the series divaricates into the double-fluid series and single- 

 fluid series, the former coinciding with the radiate and articulate 

 class, and joining the Vertebrata through the Crustacea ; the latter 

 running parallel with the Molluscan order, and connecting itself to 

 the Vertebrata through the Cephalopods. 



The fluids of the zoophytic series are invariabl}'" corpusculated, 

 but the corpuscles cannot yet be reduced to any definite type of 

 conformation. In the Medusan series these bodies become more 

 definitively organized. The author then demonstrates, that through- 

 out the whole radiate and articulate classes, wherever it is found, 

 the chylo- aqueous fluid is richly corpusculated, or in other words, 

 charged with floating morphotic elements, which, from the constancy 

 of their characters in different species, become grounds for specific 

 distinctions. It is stated, that, throughout the Echiiioderms, En- 

 tozoa and Annehda, in which, even in the adult animal, the blood- 

 proper and the chylo-aqueous fluid, though separate, coexist, the 

 latter fluid only is corpusculated, the true blood being invariably 

 limpid and perfectly fluid (incorpusculated), and almost alwa^'s the 

 seat of the colour ; the latter existing as a substance dissolved in 

 the fluid, while in no instance does colour develope itself in the 

 chylo-aqueous fluid. 



The paper then shows, that at the point vvdiere the chylo-aqueous 

 system disappears, namely at the Myriapods, the true blood becomes 

 the vehicle of the corpuscles. 



And lastly, the author adduces a great variety of observations in 

 confirmation of the statement, that throughout the whole Molluscan 

 series without exception, coinciding with his " single-Jiuid series," 

 the fluids are richly charged with corpuscles. 



The paper is accompanied by numerous illustrations, displaying 

 the characters of the morphotic elements of the circulating fluids of 

 the In vertebrata. 



March 25, 1852. 

 SIR J. HERSCHEL, Bart., V.P., in the Chair. 



A paper was in part read, entitled, " Experimental Researches in 

 Electricity : Twenty-ninth Series." By Michael Faraday, Esq., 

 D.C.L., F.R.S. &c. Received Dec, 31, 1851. 



April 1, 1852. 



COLONEL SABINE, R.A., V.P. and Treas., in the Chair. 



The reading of Dr. Faraday's paper, " Experimental Researches 

 in Electricity : Twenty-ninth Series," was resumed and concluded. 



In the present series of researches the author endeavours in the 

 first place to establish the principles he announced in the last, with 

 regard to the definite character of the lines of magnetic force, by 

 Proceedings of the Royal Society. Vol. VI. No. 87. 12 



