soiTio, df tne'bxjiei'iments thfirem c6ntainen, he was led to tnose \tnich 

 lorrii tlu; subject of the present memoir. Witli the I'onu of gas bat- 

 •^■Itery last dosctibeil iti that paper, by which the interfering action, of 

 ^''tfte external air in excluded, he finds that deutoxide of nitrogen as- 

 "■^6'ciated with oxygen gives a continuous voltaic current; and that 

 •'"tfie volumes respectively absorbed by the electrolyte are as foui'ito 

 ■■^*'6iie, indicating the formation of hyponitrous acid*. .' i' .V|\, f •• 

 bni. Passing to the more immediate object of tlie present papVr,'ne states 

 "'Hhat liaving observed nitrogen procured by the combustion of plios- 

 '"l^horns to give rise, in the gas battery, to a temporary voltaic c^r- 

 '"tent, lie was led to believe that phosphorus, although an insolijlble 

 " ^rfoii-conductor, might, by means of the gas battery, be made the 

 '^texcitant of a continuous voltaic current, analogous to the zinc ele- 

 ■■''ftient of ah ordinary voltaic combination. This expectation was ve- 

 '"Tified by experiments, a series of which is given; phosphorus being 

 'i'nspcnded in various gases and voltaically associated with oxj'^gen. 

 The experiments were continued during several months, and the 

 "results indicated the same consumption of phosphorus with reference 

 "^'fe the oxygen, as would occur by the formation of phosphorous acid; 

 the phosphorus being thus burned by oxygen at a distance. Phos- 

 ' ''J)horus and iodine, bdifi'ifdff-Cohducting solids, being each suspended 

 '^^'io nitrogen in the associated tubes of a gas battery, give a continu- 

 '^'ttiis voltaic current, and are consumed in equivalent ratios. Sulphur, 

 "^teji^h'd^ in nitrogen and associated with oxygen, gives a voltaic 

 current when fused. Other volatile electro-positive bodies, such as 

 '■'camphor, essential oils, aether and alcohol, when placed in nitrogen 

 "knd associated with oxygen, gave a continuous voltaic current. ■'. 



The autiior observes that the gas battery which in his former ex- 

 '' periments introduced gases, by the present experiments renders solid 

 and'liquid insoluble non-conductors the exciting constituents of vol- 

 taic combinations, and enables us to ascertain their electro-chemical 

 relations : it also introduces the galvanometer as a test of vaporiza- 



•Anew form of ga^^iSP^M^?^ft^^^ ^indefinite 



number of cells are charged by the liydrogen evolved from a single 

 piece of zinc ; the oxygen of the atmosphere supplying the electro- 



^ Negative element. The charge of the battery is self-sustained, in a 



*<'nianner somewhat sinlilar to the Doobereiner light apparatus. 

 *'"' "Tlie Blood-Coi-pusele considered in its different phases of deye- 

 ''Ibpnient in the Animal Series." By Thomas Wharton Jones, Esq., 



;' f^R.S., Lecturer on Anatomy, Physiology and Pathology, at the 



'' Gharing Cross Hospital. 

 ' This paper' IS divided into three parts: the first relating to the 

 blood-corpuscles of the Vertebrata ; the second to those of the In- 

 vertebrata ; and the last to a comparison between the two. He first 

 describes the microscopic appearances of these corpuscles in differ- 

 ent classes of vertebrate animals, beginning with the skate and the 

 frog, and proceeding to birds and mammifera ; first in their early 



'^Mfitolbryonic state, and next in the subsequent periods of their growth. 



d' He' finds in oviparous "\rerteb rata generally, foTir principal forms^ of 



