iv List of Contributors. 



FitzGeeald, Geo. Feas., M.A., F.T.C.D., F.E.S. page 



On the Limits to the Velocity of Motion of the Working 

 Parts of Engines, 160 



On the Temperature at various Depths in Lough Derg after 

 Sunny Weather, . . .' ". . . . 169 



Getjbb, Sie Howard, F.E.S. 



Notes on some Improvements in Equatorial Telescope 

 Mountings, 107 



Note on a Graphical Method of Solving Certain Optical 

 Problems, . 482 



Haddon, Alfeed C, M.A. 



Note on Halcampa chrysanthellum (Peach), . . . .1 



Suggestion respecting the Epiblastic Origin of the Segmental 

 Duct (Plate X.) 463 



Note on the Arrangement of the Mesenteries in the Parasitic 

 Larva of Halcampa chrysanthellum (Peach) (Plate XL) . 473 



Haetley, W. N., F.E.S. 



Note on Lackmoid and Litmin, 159 



The Black Marble of Kilkenny 486 



Analysis of the Beryls of Glencullen, Co. Wicklow, . . 626 



Haughton, Eev. De., F.E.S., S,F.T.C.D. 



On the Liassic Fossils of M'Clintock's Expedition, . . 497 



Hull, Edward, LL.D., F.E.S. 



On the Occurrence of an Outlying Mass of Lower Old Eed 

 Sandstone and Conglomerate in the Promontory of Fanad, 

 Co. Donegal, . . . 40 



On the different Varieties of Irish Paving-setts, ... 94 



On the Effect of Continental Land in Altering the Level of 

 the Ocean, 649 



