it ; but shuiild it become tu^bid, get ie^y jomc #atfef-jttg and 

 Bvphon. This latter instrument is easily constructed. Any 



piece of lead, glass, or gutta- 

 pertia tubing will do if bent in 

 the sliape shown in the engravinst. 

 Let the smaller end dip into 

 the "water ; then, taking the 

 longer end in your month, draw 

 the air out of the tube, wheii 

 the water wiU follow, and con- 

 tinue to do BO as long as the 

 shortest end continues under 

 water. When as much water 

 is taken out as you consider 

 SYPHON. necessary, you may, by means 



of the fine rose of a long-necked 

 garden or greenhouse watering-pot, restore a like quantity of 

 fresh water, which, if put in in this way, will fall like a very 

 fine shower of rain, and will aerate the water, which it is very 

 advisable should be done. Or, instead of putting the syphon 

 into the mouth, turn up both ends and fill the tube with water ; 

 place a finger over each end, to prevent the water escaping ; 

 put the small end into the water, and, taking the finger from 

 the other end, the water will flow freely. 



It is the expressed opinion of the inventor of the aquarium, 

 that three, or at most four, animate objects are enough for each 



gallon of water ; experi- 

 ence, however, has shown 

 that, with moderate at- 

 tention, double this nimi- 

 ber — of small size, at 

 least — will do well and 

 thrive in the quantity 

 of water mentioned. If, 

 however, this proportion 

 should be esoeeded, extra 

 Care must be observed to 

 keep the water thoroughly aSrated. The nosizle of a pair of 

 bellows introduced into the tank will in a rough way effect 

 this ; or it may be done by the suspension above the tank of 

 a bottle, from which drips of water are constantly falling ; each 

 drip will be highly oxygenated, and carry with it new life to the 

 £shea. 



water-SigBh. 



