1896, ] Anatomical and Physiological Researches, 231 
of asystem on adjacent and on remote parts of the plant. 
When either the root or the shoot system was incased, a plain 
retardation of the growth of the free system was always seen. 
This retardation differed somewhat from that observed when 
the part was simply amputated. Instead of a recovery fol- 
lowing the shock from the injury, the author found that the 
continued irritation from the confined parts caused a likewise 
continued retardation with a total growth (in the case of the 
tadicle) averaging about two-thirds of that of the control. 
Upon freeing the confined parts, a plainly marked accelera- 
tion of the growth rate of both systems followed. 
The cotyledons of Streptocarpus behaved in a very inter- 
esting manner. Normally one cotyledon grows until it reaches 
considerable dimensions. The other, however, remains rudi- 
mentary, and finally dies. When the cotyledon in the usual 
order of things predestined to development was put in the 
ast, the smaller usually fugacious member assumed the réle 
and grew, provided the development of the seedling had not 
already proceeded too far. A similar result was obtained by 
the extirpation of the larger cotyledon. Thus the prevention of 
gfowth in one part can awaken it in another. 
_ The question of correlation within a particular system was 
lvestigated. If the cast was so placed as to leave free the 
apex and entire growing zone of a radicle, a retarded growth 
fesulted. Neither the revival of growth in old tissues, nor a 
changed distribution of growth was found to follow the appli- 
Cation of the cast preventing normal elongation. When only 
Partially hindered, growth was reduced but not re-localized. 
. '#€n shoots of various kinds of seedlings were correspond- 
ngly treated, the correlation phenomena agreed completely 
> those seen in roots. Shoots so enclosed that growth in 
“lan merely was prevented, grew abnormally in thickness, 
"on the release from the cast it was resumed in the parts 
Still plastic, 
“ia these results, it appears that, without nutsien Ye 
ati PmMent in the sustaining parts, the sustained meri oid 
‘ fegions are unable to make a strong development. 
RH. Tru, 
Fertilization of Batrachospermum. 
In the Annals of Botany (March) Dr. Bradley M. Lape 
fettilinsts €d some important results from his parehnee ae 
Was pct Of Batrachospermum. The species chiefly rv 
* montliforme, subsequently checked by a study © 
