Academy of Science. 



which when present in quantity are troublesome, from the fact of their deposition 

 upon boiling, in the form of " scale." 



It showed a specific gravity of 1.062 or 8.8 Baume —a great density considering 

 that it was almost a surface water. Its contents of pure salt was one bushel, to 

 about 95 gallons of the brine. 



I have analyzed two samples of salt made from this brine, the samples being taken 

 from salt made at different times, as a check against untrustworthy results, from 

 accidental impurity or excessive purity. 



Both salts were made with no extra i^recautions to insure purity, and fairlj' repre- 

 sent the quality of the marketable article for table use. 

 They gave upon analysis : 



No. 1. No. 3. 



Sodium Chloride,.... 96,24 96.06 



Magnesium Chloride, 1.22 1.56 



Sodium Sulphate,... 1.65 1.87 



Calcium Sulphate, 89 .51 



100.00 100.00 



The entire absence of calcium chloride is a merit of this salt not to be overlooked. 



CALAMITES. 



By M. V. B. Knox, Professor of Natural Science, Baker University. 



In the soft sandstone on the banks of a creek about two and oue-half miles south- 

 west of Baldwin, are found Calamites in great numbers. The quarry is west of the 

 Dr. Cowgill farm, at the crossing of the main road from Prairie City, over a small 

 branch of Tahwo Creek. The Calamites are found in greatest abundance and of 

 best quality a little north of the bridge, on the west bank. 



During the winter of 1873-4, while passing down this creek in search of speci- 

 mens, I noticed some Calamites cropping out of the rock, and afterwards succeeded 

 in securing a few fine ones, but did not work the quarry to any extent, as there was 

 in our cabinet a fine lot of Calamites gathered from various other points about Bald- 

 win. Some time last winter Prof. Mudge, accompanied by Mr. Joseph Savage of 

 Lawrence, came to Baldwin, having heard of this quarry. Armed with a strong, 

 sharp iron bar for splitting up the rock, we went there with some students to 

 assist us, and in the course of three hours secured as many as fifty good speci- 

 mens, some fifteen of them being " tips," of great beauty and perfection. Since 

 then we have taken out and put in our cabinet about two hundred good specimens 

 for preservation and exchange, while a great many more have been taken out for tlic 

 State University and for different individuals. There are several other places about 

 town at which Calamites are found, probably in the same layer of sandstone, but 

 none yields specimens like this. Prof. Mudge thinks there is no other quarry equal 

 to this one, in the west. 



These Calamites represent the species cannoeformis, and transitionis, and others 

 which I have been unable to identify with my limited literature on this group of 



