316 BOTANICAL GAZETTE [APRIL 
plants of the region, including Drosera. In addition to these, 
however, it contains the following plants not usually found in bogs: 
Pseudotsuga taxifolia, Picea sitchensis, Thuja plicata, Tsuga hetero- 
phylla, Alnus oregona, Comarum palustre, Lysichiton kamitschatcense, 
a Carex, and a small orchid. It will be noted that some of them 
(e.g., Lysichiton kamtschatcense) are found on the borders of other 
bogs, and that one of them (Tsuga heterophylia) is found on the 
dry hummocks in other bogs. Apparently the partial drainage 
here has allowed the entrance of plants not found in typical bogs, 
but has not driven out the typical bog plants. 
The last of the six bogs is situated on Mount Constitution at an 
elevation of about 666 m.; the mountain itself attains a height of 
880m. It is situated on Orcas Island, one of the San Juan group, 
which lies between the strait of Juan de Fuca and the strait of 
Georgia. Several peat bogs situated on this mountain have been 
drained and thus converted into meadows, which have been used 
for both hay and pasturage. Drainage and clearing seem to have 
completely destroyed the bog flora and substituted a flora not at 
all characteristic of peat bogs. 
The bog water for use in the experiments has been obtained in 
all cases as follows. Care was first taken to select a spot that was 
centrally located in the bog and had a typical bog flora. The mass 
of vegetation and fibrous peat was cut away with a strong knife 
from an area about one foot square. Then the soft peat was 
scooped out below this until a cavity was formed that would soon 
fill with water. The water was dipped up in a wide-mouth glass 
bottle and poured into glass containers. The depth to which this 
had to be scooped out varies with the season; in winter about 
35 cm. sufficed in most of the bogs; in late summer it was necessary 
to dig 90 cm. In the case of the water obtained from the Henry 
bog on October 10, 1911, it was found that it would not accumulate 
in half an hour by digging even 90 cm. deep, and a glass jar was 
filled with very wet peat and the water was squeezed through 
cheesecloth in the laboratory. 
The tap water used was that supplied to the laboratories from a 
wooden supply tank on the University campus. It is pumped into 
this tank from Lake Washington. 
