1894.] Anatomical and Physiological Researches. 331 
A contribution to the physiology of the genus Cuscuta. 
G. J. Peirce brings out in the Annals of Botany for March, 
the results of his experiments on this interesting group of 
parasites, which has at various times received so much at- 
tention. It will be remembered that in a previous article Mr. 
Peirce described the origin, structure, and development of the 
haustoria of several species of Cuscuta and other parasites. : 
It is found that Cuscuta during the process of attachment 
to a host plant or a support has two distinct methods of form- 
ing coils. In one case by circumnutation and geotropism the 
steep loose coils characteristic of the majority of twining 
plants are formed. In the other, closely wound tendril like 
coils are formed as a result of the irrito-contractility of a 
region of the growing tip of the stem. hen a seedling 
i t the para- 
g coils, 
1 pi . 
har Live Structure of the haustoria of some phanerogamic parasites. Ann. 
- T2291. 1893. 
