yi List of Contributors. 



Mullen, Benjamin H., B.A. page 



On a Glogg Almanack in the Science and Art Museum, 

 Dublin (Plate V.), 79 



O'Beilly, J. P., C.E. 



On the Gaseous Products of the Krakatoa Eruption, and of 



- those of Great Eruptions in general, , . , .. . . 17 

 On the Antipodal Eelations of the New Zealand Earthquake 

 District of June, 1886, with that of Andalucia of Decem- 

 ber, 1884 (Plate IX.), . . 455 



Pkeston, Thomas, B.A. 



On the Inversion of Centrobaric Bodies, . . . . 639 



Eambaut, A. A. 



On a Mechanical Method of Converting Hour-angle and 

 Declination into Altitude and Azimuth, and of Solving 

 other Problems in Spherical Trigonometry, . . . 642 



Beynolds, J. Emerson, M.D., F.B.S. 



Note on a Brilliant Meteor seen at Strasburgh on the 15th 

 of August, 1886, 339 



Sollas, W. J., LL.D., D.Sc. 



Note on the Artificial Deposition of Crystals of Calcite on 

 Spicules of a Calci-sponge, 73 



Oh a Classification of the Sponges, 112 



Preliminary Account of the Tetractinellid Sponges Dredged 

 by H.M.S. "Challenger," 1872-76. Part I.— The Choris- 

 tida, • 177 



On the "Coecal Processes" of the Shells of Brachiopods 

 Interpreted as Sense-organs, . . . . . . 318 



On a Specimen of Slate from Bray Head, traversed by the 

 Structure known as Oldhamia radiata, .... 355 



Supplementary Bemarks on Oldhamia (Plate VIII.) , . . 358 



On a Separating Apparatus for use with Heavy Fluids (Plate 

 XIII.), .621 



On a Modification of Sprengel's Apparatus for Determining 

 the Specific Gravity of Solids (Plate XIV.), . . .623 



