Ti2 
The other excavations, where the strike of the dike would seem 
to indicate its existence, were all on higher ground with heavy 
mantles of drift which even this deep sewer did not penetrate. 
One other opening occurred in a return sewer on Highland 
street. The excavations passed for 180 feet through rock which 
was thought at that time might be merely sheet material from 
the dike, but I am now convinced that it was another parallel 
dike. This rock, while almost as difficult to excavate as that of 
the first dike, decayed very rapidly after a few days exposure. It 
also had more or less of a massive wedged appearance in the 
trench like the first dike, and quite unlike the banded appearance 
of the sheet, and furthermore contained many inclusions. It also 
contained numerous small red crystals, the ‘ rubies,” which the 
neighboring school children collected in abundance. None of 
these peculiar forms were found in the Dewitt, or in any of the 
Syracuse dikes at Green street. Some of them appeared to be 
perfectly crystallized garnets, but so rapidly did this rock break 
up, especially when dry, that they usually fractured’ soon after 
being exposed. A few crystals of greenish color were also ob- 
tained from the same rock, but none of either kind were 
noticed in the hard firm variety. All of these facts would seem 
to indicate a second dike more or less parallel to the first and less 
than 250 feet away. Through this second dike the excavations 
must have passed very nearly longitudinally, while the sewer 
proper crossed the main dike at nearly right angles. As the 
return sewer stopped when connection had been made with the 
sewer proper, and as the excavations up to this point did not pass 
through to the farther side of the dike, no facts as to its width 
can be given. The proximity of these dikes to those at Green 
street, which are less than a mile away, suggests some under- 
ground connection, and inasmuch as their general direction is the 
same they may be merely a continuation of those dikes. The in- 
tervening space has frequently been trenched, and at such times 
the excavations have been carefully watched for evidence of the 
dikes without revealing any trace of them. 
