76 
ad to cut out a trail as he — oe. today one may walk 
through the densest jungle for a 1 miles on trails 
carefully laid out and opened ie the custodian of the park 
covered in the forest as the trails are extended. Among the 
specimen of Pisonia which is s an accompanying plate 
e most important locality investigated is 
crowning a high sand-dune situated Lucie Sound a few 
miles south of Ft. Pierce. This hammock was noticed during a 
peculiar on account of the mixed association of temperate and 
tropical trees. In passing, it may be worth while to record that 
the third week in December, when we visited the above-mentioned 
hammock, was remarkable for its extraordinary fogs. This 
phenomenon is rare in that region; these were the first fogs I had 
observed there. 
In going north from Miami to Ft. Pierce, during the earlier 
to extend out from the Everglades. These areas of decidedly 
varying account for the well-marked difference 
in the i iene of frosts in southern Florida or explain the occur- 
rence or absence of frost, which is so often observed in adjacent 
ions. As soon as we passed out of the region of fogs, we ran 
into heavy showers, and rain accompanied us until late into the 
night. 
Notwithstanding the rain, we carried on our cactus hunt, for 
which purpose we had visited the hammock, and gathered, in 
addition to several very interesting plants of other relationships, 
specimens of a gigantic kind of Harrisia, which is identical wit 
Harrisia eriophora of the West Indies, or a species related to it, 
an undescribed prickly-pear, representing the semaphore opun- 
tias, a group not previously found in the United States; and a 
