Marine Aquaria 13 



soaked in water. Goggles of the type shown may be obtained in Hono- 

 lulu in almost every store handling fishing tackle and other sporting 



goods. 



The diving helmet. The diving helmet, very useful in warm and clear 

 waters, has become a part of the regular equipment of tropical marine 

 stations. It may not be used by an individual collector, for the opera- 

 tion requires a crew of at least two, and preferably three men to operate 

 the pump and watch the diver. For an untrained person it is inadvis- 

 able to descend beyond the 30 foot limit. 



Miscellaneous equipment. An experienced collector never forgets a 



Fig. 17.— The glass bottomed box. Fig. i 8.— Goggles. 



pocket lens of about 8 or 12 power magnification, mounted in a metal 

 frame and suspended from the neck by means of a cord. 



For collecting among coral reefs and rocks a good crow bar and cold 

 chisel are indispensable. 



Living forms should be placed immediately in a suitable container 

 about % full of seawater. An ordinary milk can, preferably of white 

 porcelain, is very convenient for this purpose. Small organisms may be 

 placed in fruit jars, bottles, or vials. Overcrowding and exposure to 

 direct sunlight should be avoided. All the containers should be kept 

 open as long as possible. In a hot climate keeping the container packed 

 in ice is sometimes necessary if the organisms are in transport for several 

 hours. 



MARINE AQUARIA 



Aquarium tanks. Various types of aquarium tanks found on the 

 market may be used successfully for keeping live material. A simple 

 water-tight box with an inlet and outlet for seawater may be used for 

 this purpose. A coat of black asphalt paint provides sufficient protec- 



