172 
rivers of the island and its main mountain ranges, together with 
the departments into which the Republic of Haiti is divided, and 
such towns of the island as are necessary to an understanding of 
these explorations 
Upon our arrival at the plantation on July 13 an extended 
drought of several weeks had been in progress, following a much 
reduced precipitation in the second rainy season which occurs 
early in the year. For this reason the wild vegetation in the 
vicinity of Bayeux was pretty well dried up, so far as herbaceous 
things were concerned. The system of irrigating ditches, sup- 
plied from the river which finds its outlet into the ocean near the 
plantation, prevented any serious damage to the cultivated plants. 
he hills to the west and south of Bayeux were extremely dry, 
the ferns and other plants of a similar habitat which grew there so 
luxuriantly in 1903 were now but shriveled effigies of their former 
beaut It was not possible, therefore, to collect to any extent 
in that neighborhood; this was not a serious loss, as a large 
collection was made there in 1903, and as the expedition of this 
year covered about the same period, few additions would have 
been made. 
During my trip of 1903, I felt unene the lack of instru- 
ments for determining altitudes, temperature and humidity, and 
before starting this year provided a one a good aneroid 
barometer, a thermometer registering maximum and minimum 
temperatures, an ordinary thermometer for miscellaneous obser- 
vations, and a hair hygrometer. I found, after a number of 
Paki au that the aneroid did not vary more than one tenth at 
yeux, ranging between 30.30 and 30.40, one-tenth on the 
ee indicating 100 feet. I decided to take as an average sea- 
level reading, Bayeux being practically at sea level, 30.35, so 
that all altitudes given in this report and indicated upon herbarium 
bels can, with a fair degree of safety, be considered within 100 
feet of the actual elevations. 
At no time during my stay, eee to the records kept b 
me, did the tpt at Bayeux go below 70° area 
(all temperature readings are in an scale), and usually not 
below 75°, these being recorded at night. The highest tem- 
