1897J MICROSCOPICAL JOURNAL. 125 



Weequachick lake was known to the Indians but has 

 disappeared now, being left as a marsh with clear places 

 in it where the water was clear but shallow. It is at 

 Waverly, about four miles from Newark and close to 

 Elizabeth. I found first that they were digging- for the 

 raili-oad just south of the Marsh and ahnost a yard down 

 they turned up a dark, almost black soil. This I secured 

 and examined. I wasdelighted to find that it consisted of 

 nearly pure brackish water forms of bacillaria. Going to 

 the })hice where they were digging to secure some more of 

 the earth, I saw that the embankment which was formed 

 of glacial moraine, in this case being in the majority of 

 sand and gravel, had been laid across a marsh which ] 

 also learned had been called Weequachick lake. But the 

 soil at the bottom had not been firm enough to bear the 

 weiglit of the embankment which had sunk, crowding up 

 the bottom of the marsh. At one place, it rose in mi na- 

 ture hill, about six to eight feet high. In this place, 1 

 collected it, and found it was peaty on top, and, for five 

 feet down, it contained brackish forms of bacillaria, and 

 below^ that for at least two feet it was made up of fresh- 

 water forms. Beneath nil was the glacial moi'aine which 

 at this place is over thirty feet thick. Where the fresh- 

 water and the brackish water bacillaria joined, there was 

 a mingling of forms, so that one could collect a fresh 

 water infusorial earth having some salt water found in it. 

 Thus, I got Navicula viridis and other forms along with 

 Tricei'alium favus. 



Then I studied the infusorial earths which I had or 

 could procure and 1 got over a hundred and I found thai 

 they all contained essentially the same fresh-water forms. 

 And I collected any clay that occurred everywhere in 

 New Jersey and I found it contained sparsely the same 

 forms. And I came to the conclusion that they were all 

 one in the Iceberg period clays of the world. This is 

 the conclusion I have come to now, 



