168 CARNEGIE INSTITUTION OF WASHINGTON. 



ment, as had hitherto been supposed, but is chiefly, if not wholly, 

 passive and inert, bearing much the same physiological relation to 

 the sodium of the sea-water as nitrogen bears to the oxygen of the 

 air. Three papers were prepared for the forthcoming volumes from 

 the Department of Marine Biology. 



It is a pleasure to acknowledge the highly appreciated gift, by the 

 Museum of Comparative Zoology at Harvard College, of a nearly 

 full set of its bulletins and memoirs. We are especially indebted 

 to the curator, Dr. Samuel Henshaw, for this valuable accession 

 to our library. 



The following papers were published during the year as a result of 

 studies upon collections made at Tortugas, Florida. 



tjber westindische Medusen, E. Vanhoffen, 1913, Zoologischen Jahrbuch, Suppl. 2, 



Heft 3, pp. 413-432, figs. A to D. 

 Observations in MoIIusks among the Bahama Islands and the Florida Keys, by 



Paul Bartsch, Smithsonian Miscellaneous Collections, vol. 60, pp. 58-62. 



The following reports on the recent researches at Tortugas are 

 in press and will appear soon in publications 182 and 183 of the 

 Carnegie Institution of Washington : 



Drew, G. H. — On the Precipitation of Calcium Carbonate in the Sea by Marine 

 Bacteria, and on the Action of Denitrifying Bacteria in Tropical and Tem- 

 perate Seas. 



Vaxjghan, T. W. — Preliminary Remarks on the Geology of the Bahamas, with 

 Special Reference to the Origin of the Bahaman and Floridian Oolites. 



Vaxjghan, T. W. — Building of the Marquesas and Tortugas Atolls and a Sketch of 

 the Geologic History of the Florida Reef Tract. 



Dole, R. B. — Some Chemical Characteristics of Sea-water at Tortugas, Florida. 



Cary, L. R. — Observations upon the Growth-Rate and (Ecology of Gorgonians. 



Clark, H. L. — Growth-Changes in Brittle-Stars. 



Tennent, D. H. — The Early Influence of the Spermatozoan upon the Characters 

 of Echinoid Larva;. 



Jackson, Robert T. — Studies of Jamaica Echini. 



Jordan, H. E. — The Spermatogenesis of the Mongoose; and a Further Comparative 

 Study of Mammalian Spermatogenesis, with Special Reference to Sex Chro- 

 mosomes. 



OsBTJRN, R. C. — The Bryozoa of the Tortugas Islands, Florida. 



Mayer, A. G. — The Effects of Temperature upon Tropical Marine Animals. 



Mayer, A. G. — The Relation between the Degree of Concentration of the Electro- 

 lytes of Sea-Water and the Rate of Nerve-Conduction in Cassiopea. 



Mayer, A. G. — The Law Governing the Loss of Weight in Starving Cassiopea. 



GoLDFARB, A. J. — Changes in Salinity and Their Effects upon the Regeneration of 

 Cassiopea xamachana. 



GoLDFARB, A. J. — Regeneration in the Annelid Worm, Amphinoma pacifica, after 

 removal of the Central Nervous System. 



GoLDFARB, A. J. — Experimentally Fused Larvtc of Echinoderms with Special Refer- 

 ence to their Skeletons. 



McClendon. J. F. — Experiments on the Permeability of Cells. 



Harvey, E. N. — The Relation between the Rate of Penetration of Marine Tissues 

 of Alkali and the Change in Functional Activity induced by the Alkali. 



Jacgb.s, M. H.— Physiological Studies on Certain Protozoan Parasites of Diadema 

 sctosum. 



GuDGER, E. W. — The History of the Spotted Eagle Ray, Aetobalus narinari, together 

 with a Study of its External Structures. 



Reinke, E. E. — The Development of the Apyrene Spermatozoa of Slromhus biiuber- 

 culatus. 



Dahlgren, Ulric. — Origin of the Electric Tissues of Gymnarchus niloticus. 



