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ADDITIONS. 



Platz, (Dr.'). Geognostische Mittheilungen iiber 

 einen Theil des Schwarzwaldgebirges. Deutsch. 

 Naturf. Versamml. Bericht, XXXIV., 1858, pp. 

 74-76. 



Pogson, Norman Robert. 4O. Observations of 

 solar spots about the time of the total eclipse, 28 

 July 1851. Astron. Soc. Mem. XXL, 1852, 

 pp. 117-120. 

 Poiseuille, ./. L. M. : 



To No. 3 add reference : 



Bibl. Univ. LX., 1835, pp. 269-278. 

 Pole, William. 12. On the double cylinder ex- 

 pansive steam-engine. Mech. Engineers Instit. 

 Proc. 1862, pp. 242-258. 

 Poll, Gius. Xav. : 



To No. 2 add reference : 

 Wiedemann, Archiv. I. (Hft. 2), 1800, pp. 



164-208. 



Follak, 0. Vermischte Analyse : Braunkohlen 

 von Parschlug ; Porzellanerde von Brenditz. 

 Wien, Geol. Jahrb. III., 1852 (Hft. 1), pp. 158- 

 161. 



2. Analyse des Schieferthons von Korit- 



schan in Mahren. Wien, Geol. Jahrb. III., 

 1852 (Hft. 2), p. 157. 



3. Kohlen aus der Quadersandsteinforma- 



tion von Lettowitz analysirt. Wien, Jahrb. 

 Geol. IV., 1853, p. 154. 



Polli, Giovanni : 



To No. 53 add reference : 

 Atti Soc. Elvet. XLIV., 1860, pp. 167- 

 182. 



Pollock, (Sir) Frederick. 9. On some remark- 

 able relations which obtain among the roots of 

 the four squares into which a number may be 

 divided, as compared with the corresponding 

 roots of certain other numbers. [1858.] Phil. 

 Trans. 1859, pp. 49-59. 



Pollock, Thomas. 8. On the connection between 

 the atomic arrangement and the conducting 

 power of bodies. London, Electr. Soc. Proc. 

 1837-40, pp. 145-147. 



9. Further proof of the truth of the theory 



of vibration, from recent experiments of Mr. 

 CLARKE. [1838.] London, Electr. Soc. Proc. 

 1837-40, pp. 156-157. 



1O. An examination of the two theories of 



homogeneous attraction and repulsion of the par- 

 ticles of the electric fluid. London, Electr. Soc. 

 Proc. 1837-40, p. 161*. 



11. Why should a striking distance occur 



in frictional, and not in voltaic electricity ? 

 London, Electr. Soc. Proc. 1837-40, pp. 164- 

 165. 



12. An attempt to answer some objections 



made to AMPERE'S theory of electrical currents 

 in the magnet. London, Electr. Soc. Proc. 

 1837-40, p. 178. 



Pollock, Thomas. 13. On the connection be- 

 tween the electric phenomena of the striking 

 distance and latent heat. London, Electr. Soc. 

 Proc. 1837-40, pp. 179-180. 



14. The current in the secondary wire, the 



result of the disturbance of the equilibrium of 

 its latent heat. London, Electr. Soc. Proc. 

 1837-40, pp. 185-186. 



15. Application of Dr. BLACK'S Law of 



Capacity for Heat to the explanation of elec- 

 trical phenomena. London, Electr. Soc. Proc. 

 1837-40, pp. 200, 204-206. 

 To No. 4. add reference : 

 London, Electr. Soc. Proc. 1837-40, pp. 



154-156. 

 Pomel, Auguste : 



To No. 12 add reference : 

 Edinb. New Phil. Journ. XLIIL, 1847, pp. 

 6-10. 



Pomme, : 



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Berlin, Zeitschr. Acclimat. IV., 1861, pp. 



192-196. 



Poppe, Adolph. 1O. Beobachtung eines schon- 

 en Interferenz- und Farbenphanomens beim 

 Durchgang eines Sonnenstrahls durch eine feine 

 mit Wasser oder Oel gefiillte Oefnung. [1855.] 

 Frankfurt, Jahresb. Phys. Ver. 1853-54, pp. 

 36-40. 



11. Ueber die Reibungscurve und das 



Rotationsconoid von constantem Reibungsmo- 

 mente. [1859.] Frankfurt, Jahresb. Phys. Ver. 

 1857-58, pp. 64-73. 



12. Photometer zur Controle der offent- 



lichen Gasbeleuchtung. [1859.] Frankfurt, 

 Jahresb. Phys. Ver. 1857-58, pp. 74-77. 



To No. 8 add reference : 

 Frankfurt, Jahresb. Phys. Ver. 1852-53, 



pp. 31-41. 



Porrett, Robert. 13. On a curious formation of 



Prussian-blue. [1842.] Chem. Soc. Proc. 



1843, p. 35. 



Poschl, Eduard. 



benholzer. 

 372-384. 



Ueber Conservirung der Gru- 

 Berg. u. Huttenm. Jahrb. 1859, pp. 



Poselger, H. 2. Ueber das Cochinchina-Huhn. 

 [1857.] Berlin, Zeitschr. Acclimat. L, 1858, 

 pp. 81-90. 



3. Die Malayen-Hiihner. Berlin, Zeit- 

 schr. Acclimat. IV., 1861, pp. 108-111. 



Posselt, W. Etwas iiber den Berger Leber- 

 Thran. Mag. fur Pharm. XV., 1826, pp. 100- 

 103. 



Posselt, If'., und L. Reimann. Chemische 

 Untersuchung des Tabaks, und Darstellung des 

 eigenthiimlichen wirksamen Princips dieser 

 Pflanze. Mag. fur Pharm. XXIV., 1828, pp. 

 138-161 ; XXV., 1829 (Hft. 2), pp. 57-83. 



