AQUARIUM. 



211 



His son was given free rein and, well, 



that son went to the worse." 



Then I went to my desk and wrote the 



first paragraph of this article. 



* * * * * * * * 



(Cylinders and globes are made of 

 soft white glass that has the habit of 

 considerable expens-jon and contrac- 

 tion, and when not most carefullly 

 annealed will break from very slight 

 causes. The heat of the sun on 

 one side will produce sufficient expan- 

 sion to cause* explosion ; setting on a 

 hard or uneven surface will cause crack- 

 ing and the weight and pressure of the 



contents breaking, and moving without 

 lifting them clear will cause a deluge. A 

 scratch with a nail not over one inch 

 long so weakened a twenty inch cylinder 

 that it broke within an hour. 



Fish globes are a crime, and all-glass 

 cylinders a curse. 'Ware free of them. 

 Use only metal-framed aquaria; they are 

 the neatest, strongest and best forms 

 f( >r their contents. Globes suffocate fish ; 

 cylinders break from very slight causes. 



I wish I could have a national law 

 passed to imprison every dealer for life 

 who sold a torture chamber for fishes — 

 a fish globe!— H. T. W.) 



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MINERALOGY 



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Address all correspondence to Arthur Chamberlain, Editor, 56 Hamilton Place, New York City 



Selenite. 



Selenite is one of the varieties of 

 gypsum, a mineral that is used princi- 

 pally in the manufacture of plaster of 

 Paris and like products. It is a sulphate 

 of lime ; that is, it is a compound of sul- 

 phur and lime with some water. It is 



found in extensive deposits in New 

 York, ( )hio, Illinois, Virginia, Tennes- 

 see and Arkansas, and sparingly in a 

 number of other states. It is also found 

 in Nova Scotia and in most foreign 

 countries. 



It occurs generally in transparent, 

 doubly terminated crystals, sometimes 

 singly and at other ■ times in groups. 

 Fig. i shows some of the crystals and 

 groups. Fig. 2 shows the interior of a 

 small selenite cave found in Wayne 

 County, Utah. It is thirty-five feet 

 long, ten feet broad and twenty feet 

 high. The whole interior was filled 

 with transparent selenite crystals of 

 immense size. One group of crystals 

 taken from this cave weighed six hun- 

 dred pounds. It was the finest deposit 

 of selenite ever found. Over twenty 

 tons of fine crystals were taken out and 

 shipped to Salt Lake City. 



FIG. 1. SELENITE CRYSTALS. 



Some Curious Boulders. 



Our first insight into mineralogy is 

 very often from finding or observing 

 some curious pebbles or boulders while 

 on nature strolls through the country. 



