538 REPORT— 1893. 



rooms are now being prepared, capable of accommodating double or treble 

 the present number of books. Tbe Director is unrelenting in bis exertions 

 to make the Library as complete as possible, and it is his aim that it 

 should one day rank as the most complete Zoological Library in 

 existence. 



The progress of the various publications undertaken by the Station is 

 summarised as follows : — 



1. Of the ' Fauna und Flora des Golfes von Neapel ' the monograph 

 by Dr. Giesbrecbt on ' Pelagic Copepoda ' (831 pp., 54 plates) has been 

 published ; and two other equally large monographs by Professor Delia 

 Valle on ' Gammarini ' (about 950 pp. and 60 plates) and by Professor 

 Spengel ou ' Balanoglossus ' (about 800 pp. and 30 plates) will appear 

 before the end of the year. Monographs by Dr. W. Miiller on ' Ostracoda' 

 and by Dr. Jatta on ' Cephalopoda ' are ready, and the printing of the 

 former has been commenced. Monographs are being prepared by Dr. 

 Biirger on 'Nemertinea,' by Professor Apathy on ' Hirudinea,' by Professor 

 Ludwig on ' Echinodermata,' and by Dr. Scheviakoff ou ' Foraminifera ' ; 

 and a botanical monograph by Professor Falkenbei-g on ' Rhodomelese ' is 

 nearly ready. 



2. Of the ' Mittheilungen aus der Zoologischen Station zu Neapel,' 

 vol. X., parts iii. and iv., with 18 plates, have been published ; and vol. 

 xi., parts i. and ii., with 13 plates, are in the press. 



3. Of the ' Zoologischer Jahresbericht ' the whole ' Bericht ' for 1892 

 has been published. 



The details extracted from the general report of the Zoological Station, 

 which have been courteously furnished by the officers, will be found at 

 the end of this report. They embrace lists (1) of the naturalists who 

 have occupied tables since the last report ; (2) of the works published 

 during 1892 by naturalists who have worked at the Zoological Station. 

 A list of the specimens sent out by the Station during the past year has 

 also been furnished. 



L Report on the Occupation of the Table. By Mr. Cecil C. Duncan. 



The algse to be experimented upon were kept in a large tank, with a 

 good stream of water running through, until they had the appearance of 

 being quite healthy. The determination of the composition of the 

 gas given oflf from the different coloured algse, when subjected to the 

 action of different coloured light, was then proceeded with. The coloured 

 solutions, &c., are as follows : — Diffused daylight ; red glass which passed 

 only rays from about B of the solar spectrum to midway between C and D ; 

 yellow light from a saturated solution of bichromate of potash which 

 passed rays from B to about midway between D and E ; violet glass 

 passing all the blue and violet and a little red and yellow light ; violet 

 light from a strong solution of ammonio-cupric sulphate which absorbed 

 all light up to B, and finally a dilute alcoholic solution of chlorophyll from 

 grass. The gas analyses were made in the gas-room attached to the 

 chemical laboratory, according to Bunsen's method, the CO2 being deter- 

 mined by absorption with NaOH and the O2 by explosion with hydrogen. 

 The N2 was determined by difference. The same portion of the plant 

 was experimented on with the coloured solutions, &c., mentioned above. 

 Diffused daylight produced the maximum quantity of O2, and only in 

 four out of seventeen cases did coloured light produce more, viz. — 



