128 Harris: THE TIssuE FLuips oF CUSCUTA 
While some of these Loranthaceae are leafless species, all are 
chlorophyll-bearing. The ood of a form less capable of 
photosynthesis seems desirable 
Ill. PRESENTATION OF DATA 
As far as I am aware determinations on Cuscuta have not been 
published heretofore. The purpose of the present note is to call 
attention to a few readings made on plants growing under a rather 
wide range of environmental conditions. 
A single set of determinations} of osmotic concentration in 
atmospheres, P, as computed from the freezing point depression, 
‘\, made in August, 1914, on Cuscuta sp. growing on Impatiens 
biflora Walt. in saturated soil at Cold Spring Harbor, Long Island, 
gave for the stem and leaves of the host and for the stems of the 
parasite: 
Freezing point Osmotic concentration in 
Sample Number depression, A atmospheres, 
Stems of Impatiens, C14431 A 4.88 
Leaves of Impatiens, C14431 B 0.46 5.55 
Stems of Cuscuta, C14431 C 0.45 5.36 
The host and parasite do not seem to differ significantly in 
osmotic concentration. 
A single determination was made on Cuscuta sp. growing on 
Chrysoma laricifolia (A. Gray) Greene at the mouth of Pima Can- 
yon, Santa Catalina Mountains, Arizona, April 3, 1914. The 
host tissue was accidentally lost. The parasite gave: 
Freezing point Osmotic concentration in 
Sample Number depression, A atmospheres, P 
C14131 B 0.74 8.90 
The osmotic concentration of the desert Cuscuta is higher than 
that growing in the hydrophytic habitat. 
* This fragment is published because of the fact that the writer hasbeen 
unable, notwithstanding persistent effort during the past several years,’ to 
secure sufficient materials for further determinations. 
+ All determinations of physico-chemical constants of the expressed tissue 
fluids have been determined by a technique employed during the past several 
mber of investigations. Methods and results have been recently 
reviewed elsewhere (3), 
