1902] CURRENT LITERATURE : 81 
' bodies. Both the enucleated and multinucleated cells formed by the migra- 
tion of the nuclei generally die. The neighboring cells then grow into the 
region thus left vacant. The nuclei generally wander to that part of the cell 
wall where it is growing most rapidly. 
! The paper constitutes a very suggestive contribution to a comparatively 
| new field in physiological research. All the material experimented upon 
was afterwards killed in Flemming’s or Carnoy’s killing fluid and stained 
with the triple stain. Such a combination of experimental and histological 
4 technique is to be commended as a method by which in many cases more 
accurate results in the study of the physiology of the cell may be acquired 
than by the use of either method alone.— H. G. TIMBERLAKE. 
TEoDoRESCO* has published some valuable organographic results that 
4 should have been noted sooner. The topic of the first paper is the influence 
; of different luminous radiations on form and structure, and the author makes 
| general conclusions of a very satisfactory nature. He finds that in all cases 
blue light acts most like white light, and green most like the dark, while red 
light is intermediate. For example, leaves show a maximum of surface in 
blue light, and a minimum in green, while stems elongate most in green light 
and least in blue. Some leaves (as in the Crassulaceae) and most petioles 
agree with stems. Petioles that elongate most in blue light elongate more 
in white light than in the dark. Palisade cells, chloroplasts, conductive 
cells, and bark develop best in blue light, least in green. Some roots elon- 
gate more in white light than in the dark, of others the reverse is true, while 
a still others are neutral. Blue light, as compared with green light also shows 
is roots to be of three classes. The author holds that blue light increases — 
thetic energy as compared with red or green light. 
__ The second paper treats of the indirect action of light on stem and leaf. 
_ *he author grew plants wholly in the light, wholly in the dark, and partly a 
inte dark, hoping to settle as between the view of Sachs that leaves can 
“ develop fully i in the dark if well nourished by means of other leaves in the . 
light, and the view of Frank and others that light has no such indirect. influ- 
. bape . Most experiments confirmed Sach’s well-known investigations, leaves 
) §reater size in the dark if other leaves on the same plant were — 
; ats 1¢ leaves were also thicker, and the bundles, mechanical tis- 
3, and epidermis more developed than on plants wholly in the 
: stems were longer in partly lighted plants than in either of the 
er cases, thus agreeing with Sachs. In several lianas, however, Teodoresco 5 
: with Frank that indirect light differs in no respect from total darkness. 8 
4 third ‘Paper# Teodoresco gives the results of his studies on pee : 
: t. Bot, Vu. “10: Sashes 1899. ee 
