96 DISCOVERY REPORTS 



biological laboratory the microscope cases are screwed to the benches, and the micro- 

 scopes themselves can be similarly secured. 



Some further details of laboratory equipment are given later under "Laboratory 

 Methods". 



ROUGH LABORATORY 



The rough laboratory is situated at the after end of the deck housing on the port side, 

 conveniently near to the after vertical reel and the poop, from which nets are worked. 

 It is a long narrow room, with one door opening to the after deck and another near its 

 forward end to the port alleyway (Plate IX, fig. 2). A high bench for the keeping of 

 deck log books, for the reduction, bottling and labelling of plankton samples and for the 

 sorting of the catches of dredges and trawls, runs along the outboard side. Underneath 

 it are drawers and open stowage space for the large trays and bowls used for sorting the 

 hauls of dredges and trawls. At its forward end is a sink with salt water and hot and 

 cold fresh- water taps. Above the sink is a 20-litre aspirator bottle containing weak 

 formalin. Against the forward bulkhead on the inboard side is a gimbal table smaller 

 than that in the biological laboratory and above it is a rack for i and 3 lb. jars — those 

 most frequently used for the larger plankton samples. 



On the inboard side there is a low cupboard in the after corner and running forward 

 from it two long racks, the lower with circular holes for the stowage of the larger plank- 

 ton net buckets, the higher few open glass jars used in plankton work. Forward of the 

 lower rack and between it and the forward door is an electrical centrifuge. 



On the bench there are racks for specimen tubes and for the three sizes of settling 

 tubes which are sometimes used for concentrating plankton hauls ; on the after cupboard 

 there is a fiddle for the i-lb. jars which are always used for small vertical plankton hauls. 

 The laboratory is naturally lighted by three ports in the ship's side above the bench and 

 electrically by two ceiling lights and a bracket lamp over the bench. 



A speaking tube from the rough laboratory to the bridge has recently been fitted so 

 that easy communication can be maintained between the scientific officer supervising the 

 fishing of the nets and the officer of the watch handling the ship. 



PHOTOGRAPHIC ROOMS 



The enclosed space in the centre of the officers' accommodation on the main deck is 

 divided into two unequal parts. The smaller forward part, entered by a door from the 

 larger room aft, is the dark room. It contains a sink with cold fresh- and salt-water taps, 

 a lead-covered bench, racks for developing dishes, shelves and cupboards for the storage 

 of chemicals and photographic plates, and other usual dark-room equipment. The dark- 

 room lamp above the bench can be controlled either by a switch at its base or by another 

 just inside the door. A Phillips X-ray viewing lantern is fixed to the bulkhead above 

 the sink. 



The larger room is used occasionally for photographic purposes and partly as a store- 

 room. On the after port side is a bench carrying a sliding horizontal whole-plate camera 



