56 
graft of two trunks of the American elm caused considerable 
interest. 
Finally we reached the Alpinetum, on top of which we in- 
spected a deep and wide gouge, carved out from very hard rock 
of Precambrian age during the glaciation periods in early Quater- 
nary time. We continued to the Bronx River, passing Acer rub- 
rum, A. saccharum, Quercus alba, rubra, palustris, and velutina, 
Liriodendron Tulipifera, Liquidambar Styraciflua, Cornus florida, 
Carpinus caroliniana, Betula lenta, and others. 
We now entered the hemlock grove with its fine stand of 
Tsuga canadensis, probably the southernmost stand of any con- 
siderable size near the seacoast. Proceeding north on the western 
bank of the gorge toward the boulder bridge, we came upon a soli- 
tary Kalmia latifolia which had escaped destruction by so-called 
nature lovers. Here and there the trailing shoots of Mitchella 
repens spread over the ground along the path. 
About sixty feet south from the boulder bridge on our left, 
and about twenty-five feet from the path, we came upon the re- 
mains of a pothole about fourteen feet deep, with its eastern wall 
broken. Higher up on the same ledge there is another pothole. 
A large boulder of diabase from the Palisades was found lying 
at the bottom of the pothole beside a tree of considerable size. 
Only a few feet from this pothole is another, much smaller ex- 
ample. At this point the leader explained the diversion of the 
Bronx River from its former course along the present road-bed 
of the New York Central Railroad, emptying into the Harlem 
River at about the Third Avenue Railroad bridge, to its present 
course across the plain (now occupied by the Salicetum) to the 
gorge, emptying its waters into Long Island Sound. 
Passing Cryptomeria japonica, Sciadopitys verticillata, the um- 
brella pine from Japan, Cedrus atlantica from the Atlas Moun- 
tains of North Africa, and Diospyros virginiana, the persimmon 
tree, the party now turned toward the Museum, where fossil 
prints and literature on fossils were inspected and discussed. 
Max A. ELWERT 
SunpAY, FEBRUARY 15 
Twenty-nine members and guests made the Kreische = 
Staten Island trip, which was favored by crisp, bracing, at 
weather. Nature study enthusiasts secured several large coy 
TV. ille, 
