PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol. xxxiv, No. 221. 



CONTENTS. 



C I 'June 15, 1882. 



I; Researches on Spectrum Photography in relation to New- 

 Quantitative Chemical Analysis. By W. IS". Haetlet, F.R.S.E., 

 &c, Professor of Chemistry, Royal College of Science, Dublin . 81 



II. On the Reversal of the Metallic Lines as seen in Over-exposed Photo- 

 graphs of Spectra. By W. N. Haetlet, F.R.S.E., &c, Professor 

 of Chemistry, Royal College of Science, Dublin . . .84 



III. Experiments on the Value of the Ohm. Part I. By R. T. Glaze- 

 beook, M.A., F.R.S., Fellow and Assistant Lecturer of Trinity 

 College, Demonstrator at the Cavendish. Laboratory, Cambridge, 

 and J. M. Dodds, B.A., Fellow of St. Peter's College. Part IL 

 By R. T. Glazebeook, and E. B. Saegant, M. A., .Trinity College 86 



IV. On a Deep Sea Electrical Thermometer. By C. William Siemens, 

 D.C.L.,F.R.S. . 89 



V. On the Coxal Glands of Scorpio hitherto undescribed and correspond- 

 ing to the Brick-red Glands of Limulus. By E. Rat Lane:esteb, 

 M.A., F.R,S., Jodrell Professor of Zoology in University College, 

 London . . . 95 



VI. Note on the Differences in the Position of the Ganglia of the Ventral 

 Nerve-cord in three Species of Scorpion. By E. Rat Lakkestee, 

 M.A., F.R.S., Jodrell Professor of Zoology in University College, 

 London . . . . • • • • • • 101 



VII. On the Specific Heat and Heat of Transformation of the Iodide of 

 Silver, Agl, and of the Alloys, Cu 2 I 2 .AgI, Cu 2 I 2 .2AgI, Cu 2 I 2 .3AgI, 

 Cu 2 I 2 .4AgI, Cu 2 I 2 .12AgI, PbI 2 .AgI. By Professor M. Bellati 

 and Dr. R. Romakese, Professors in the University of Padua . 104 



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