880 NOTICES OF BOOKS AND MEMOIRS. 
however, into the conflict which a young seedling enters upon 
when first it raises its green organs to the light. Gravitation 
nt i variou 
parts of plants; and in Chaps. x. and xi. the ‘ Movements of 
we are placed in possession of the results of man 
observations. Geotropic movements cannot be controlled to the 
extent possible with others, but the authors have ingeniously 
overcome many difficulties. Here again the influence of gravitation 
is considered to be ter) effectual in modifying the direction 
movement already present; if the modification 
e sho run the risk of doing injustice if we 
attempted to review ries ae et part of the work; it is no 
easy task to see one’s way through the various and varying 
1} hours,—seems inexplicable on other obvious supposition 
than that the influence of ravitetton uf acted long enough while 
e tip was on, to cause the necessary changes for perish at a 
later ee 
But snc ot conclude this pea a survey of an immense 
concerned with these problems ; ate only is “this work a valuable 
must be taken into account; and alth pastes e avoid the worn-out 
terminology of a vicious dualism, the life of an organism depen 
on deeply-involved actions and reactions not to be revealed entirely 
by our present means. We do not know what causes the alternate 
