INFLUENCE OP aOLAR RAYS ON THE GROWTH OP PLANTS. 19 
TtaulSr 7 «”'! ‘hat «>'! cteDges due to Mime power 
■"‘erfered w.th, »l™ upon ull those inorganie bodies wl.ieh 
beta f “I" <=l'emieai radiations, that change 
Theim ““‘J'f"!’ ''S'“ ® “ powerfully interfering ng. nt. 
onerar,mo““ Mtagonistic forcM-light and actinism— 
Xction '"'h “ "tganic body presents a differed scale 
the^iM^™f''f'’" matter undergoes no change by 
it on nsT P” •“[ “'““'“■'peotaun.dr of white light; spread 
fn«trnruwT ■‘"'"'.p™ or gelatine, and all that ,/rtion of the 
^ gtoen ray blackens it; and if wo conibiuc this salt with 
unstable orgaaie compounds, the blackening is found to take place, erentuallv 
£e fa^te7t£!Sn nianoer. From a knowledge of 
as corrSv be devised for AM^rtaining. 
as corrtetly as possible, tlie entire qimwtity of this chemical liriocinle oassitiff 
tnoV-dge any result would he almost 
the itiodiiiPri radiy 1 have therefore determined the induence of 
unon onrail t? “f«ivcr salts; secondly, 
mSs T'' ooDihijiatiuns of the organic and Inorganic 
not been hithorfr amveU at a degree of correctness which hoa 
qltiraWgt^Snl'’”''’ I'*- oon«i- 
of SigrdcSTc“o? 21“““ ?"“* 8““''"“'” 
statlen, if "hi 0 ?!'’ 17'““'. ‘'‘‘"T' 
alan. j 844 vol xln? V H Oarducr (American .loumal of Science, 
18W ta VMnil i'fl, H "f oxpcrimcntn triad b, him it 
nntely hanSs til 1“^ prwmabn rays themselves. It huwever unfortu- 
of siSflic I ■“ "? 'V™'”'"-''' ""y k"«w‘«lgo of the degree 
hitr^Dr 2le “ fo'-tho prismaL rays with 1,is 
SonTdonh^'rZ 77''!" oon-obnmting those of Or. Draper, are 
must contno)l that wo “ /“** teasons which ! havu alreaily given, I 
by the prism so offoot n ““ ^^tore n separate action of light ana actinism 
tiou anlf '‘I “• "’“'•'■“f ‘“'‘lb" I »lmll Imvo 
u luention a niodihcation ot mv v ew« ««».i tl,,. _r.ai.j_ l..i . .. 
i^'ell as from ’finii.. . oiwervatiom of fngonliousz and Scniicbier, as 
eonditioiw nlm / ®^P®“ence, that the absence of solar light is one of the 
I'^c should nr f lor the germination of seed, and consequently 
»o retard if. conlraiy, as in Mr. Hunts experiments, 
for if (h« '» ohjection to which this statement ti liable, 
iHised fa« «ia* A *1*^ operating cause by which carbonic aciil is decom- 
^xpect th-bi ' f r cldorojiliyi produced, we should also 
foEu, hulD" !! " w It would exercise a highly 
the vceetatifiH a? * presence of oxygen is necessorj- for 
with a^TiArf f that this oxygen is absorbed, and by uniting 
P on of the carbon ot the seed reaiipears in the form of carbonic 
C2 
