228 
Shiv Ram Kashyap. 
(3) It is assumed since Prank’s researches that the host 
derives part of its food from the carbon compounds which the 
mycorhiza draws from the humus in the soil. 
Conclusions. 
The example of Arbutus supports Rayner in the belief that 
symbiosis with endophytes is a general rule, at least, for Orchidacese 
and Ericaceae. 
It shows again that the so-called symbiosis is a form of parasit¬ 
ism in which an equilibrium exists between the invading power of the 
fungus and the resisting power of the host; also, that it is a 
reversible phenomenon—profitable to both symbionts so long as 
the equilibrium remains balanced; but each is ever ready to assume 
the character of parasite and bring about the death of the other. 
Station Biologique, Arcachon, France. 
May, 1917. 
LITERATURE CITED. 
1. Rayner, M. C. Recent Work on Endotrophic Mycorhiza. The NkW 
Phvtologist, October, 1 9 11> . 
2. Coville, F. W. The Wild Blueberry tamed. The Nat. Geog. Mag., 
Washington, June, 1916. 
3. Dufrenoy, J. Les donnees actuelles et les problemes de la Phytogeo- 
graphie. Revue Generale des Sciences, 30 Mai, 1917. 
4. La Pesque, F. Notes Scient. et medic, sur Arcachon. (In the press.) 
5. MacDougal, D. T. Environic factors. Popular Science Monthly, 
May, 1914. 
NOTE ON T ARGIONIA HYPOPHYLLA.. 
I N 1914 the writer published some of his observations on a 
form of Targionia hypophylla which he had collected at 
Mussooree (New Phytologist, Vol. XIII, Nos. 6 and 7). Since 
then the writer has found that the plant is pretty common through¬ 
out the whole of Garhwal. The form from Mussooree was described 
as a distinct variety as it presented several differences from the 
