January 4, 1884] . | SCIENCE. 9 
value of which does not require comment. The 
furnishing of the building was simple, —tiled capable of taking us to any points about the 
tables, with lights only; and other luxuries sounds and rivers, or even of venturing out to 
were dispensed with. Not even were pumps’ sea when Old Prob did not menace with dan- 
erected to maintain a constantly renewed ger-signals. ‘The launch was most useful, and 
stream of salt water circulating through the was in service almost every day for dredging, 
aquaria. In their place was used the cheaper trawling, or carrying parties out to tow in the 
and yery effective device of aeration by means open ocean. She is, however, but a passing 
and with a draught of about thirty inches, 
of a stream of fresh air constantly forced stage, as her name Nauplius implies; and we 
through the aquaria by a Sprengel pump. 
hope some day to possess a full-grown steam- 
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YACHT AND STEAM-LAUNCH OF JOHNS HOPKINS MARINE LABORATORY. 
Facilities for work were not, however, in the vessel, in which we can with safety explore the 
least curtailed ; and all the apparatus for cap- deeper waters offshore, which are as yet al- 
ture and means for getting about were pro- most entirely unstudied. 
vided. The dredge and trawl, spade and sieves During the past summer the navy has re- 
for bottom fauna, towing and dipping nets of ceived an important addition in the form of a 
silk bolting-cloth for surface forms, and many yacht, to be called the Zoea, though at present 
special traps devised for the capture of partic- otherwise registered. She is a full-rigged 
ular animals, formed a complete array of appli- sloop, forty-seven feet long, fifteen feet beam. 
ances. [Besides its small boats, the laboratory She won a silver cup in a regatta upon the 
has for several years possessed a steam-launch Potomac while in her former service, and her 
of Herreschoff pattern, twenty-seven feet long, speed was a pleasant feature of collecting-trips 
