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•WISCONSIN" ACADEMY SCIENCES, AKTS, AND LETTERS. 



XX. and XXI. are crude and washed clay from Mr. Canning's 

 well. XXII. and XXIII. are both washed samples, from dijfferent 

 pits. XXIII. was 43.39 per cent, of the unwashed clay. All of 

 these clays are very white, but appear to be much charged with 

 alkali even after washing. 



On the northwest quarter of section 10, town 21, range 5 east, 

 on the land of Mr. Moses M. Strong, on the west bank of the river, 

 kaolin occurs underlying sandstone. The clay shows at a number 

 of places at different levels above the water, but these do not prob- 

 ably indicate] a continuous mass. Two samples were taken from 

 the opening at this place, one at a higher level than the other. 

 The following are analyses: 



XXIV. and XXV. are the same clay, before and after washing, 

 taken from the upper portion of the opening. XXVI. and XXVIT. 

 are crude and washed clay from a lower level. The percentage of 

 alkalies does not appear to be lessened by washing. 



About half a mile below this place the last Archaean rocks are 

 seen in the bed of the stream, and resting directl}^ upon them the 

 sandstone. Sections showing the exact junction of the two ter- 

 ranes are common in this vicinity. A detailed section across the 

 river was taken at one place, the water being very low. It is an 

 interesting one, and I have condensed it in Fig. 2. 



