371 



Society a continuation of these researches; devoting the next series 

 to the points of maximum intensity. 



" Memoir on the Metamorphoses in the Macroura, or Long- 

 tailed Crustacea, exemplified in the Prawn (Palcemon serratus)." 

 By John V. Thompson, Esq., F.L.S., Deputy Inspector-General of 

 Hospitals. Communicated by Sir James Macgrigor, M.D., F.R.S., 

 &c. 



Theauthor gives descriptions, illustrated by outline figures, of three 

 different stages of growth of the Prawn ; the first being that of the 

 larva immediately on its exclusion from the egg ; the second, at a 

 later period, when it has acquired an additional pair of cleft mem- 

 bers, and a pair of scales on each side of the tail ; and the third, at 

 a still more advanced stage of development, when it presents the 

 general appearance of the adult Prawn, but still retains the natatory 

 division of the members, now increased to six pair. The author 

 thinks it probable that an intermediate stage of metamorphosis exists 

 between the two last of these observed conditions of the animal. 



February 11, 1836. 

 DAVIES GILBERT, Esq., Vice-President, in the Chair. 



David Baillie, Esq., and Dr. Archibald Robertson, were elected 

 Fellows of the Society. 



A paper was in part read, entitled, " On Voltaic Combinations." 

 In a letter addressed to Michael Faraday, Esq., D.C.L., F.R.S. 

 Fullerian Professor of Chemistry in the Royal Institution of Great 

 Britain, &c, &c. By John Frederick Daniell, Esq., F.R.S., Pro- 

 fessor of Chemistry in King's College, London. 



February 18, 1836. 



FRANCIS BAILY, Esq., Vice-President and Treasurer, in the 



Chair. 



John Green Cross, Esq., was elected a Fellow of the Society. 



The reading of Mr. Daniell's paper, entitled, " On Voltaic Com- 

 binations," in a letter to Michael Faraday, Esq., D.C.L., F.R.S., 

 &c, was resumed and concluded. 



The author, after expressing his obligations to Mr. Faraday for 

 the important light which hislate researches in electricity have thrown 

 on chemical science, proceeds to state that in pursuing the train of 

 inquiry which has thus been opened, he has obtained further confir- 

 mations of the truth of that great principle discovered and esta- 

 blished by Mr. Faraday, namely, the definite chemical action of 

 electricity; and has thence been led to the construction of a voltaic 

 arrangement which furnishes a constant current of electricity for 

 any required length of time. 



For the purpose of ascertaining the influence exerted by the dif- 

 ferent parts of the voltaic battery in their various forms of combi- 



