,
THE
* FOOD QUESTION
—
309 ,
millions in May, then folloWed a rapid deCline to the mini—
mum
over
13,000 iri August, with a se00nd' smaller
maxi1ñüm'of 319,000 in October.
In an interesting manner
he correlattes this variation with
Changing coditio cf
the water.
In “spring, Whenthe :diat0‘ms'are‘ absorbihg the
carbonic acid, the water rs’ alkalirieï; ini—the gsùr'hi‘e'rÏte
alkalinity de01inës because'the animal plànktôu i‘èthèh eating
up the diatom's and giving o —'catbo"nic' acid.
’
'The last
increases— 'to a maximum in the Winter, Wlien the diàteis
begin again,—and so=0‘ri.1i
’
1
:
Ï
‘
.
A
diatdfns
in such
of
.
Species or{gÏeñera …
and, the _Îgenera reach their' maxima in
different
Thus Biddülphia is most 'ail5undarit i"n '
Àpril, Chætoce‘r‘asirr May and Rhizosolenia usually in June;
Some idea of the qùantities present may be gained from the!
_
_
fact that in one haul about 58 millions of Chætoceras"bellS
were obtained, àI}_d of these
,
spef0ies,. -,;
,?
«ï
;;—=
i;}=ï
*
"
:£j==-ïAllë_i}:‘C—Iç9ié£7äîfehàs madesomen0teworthyeXpenments
‘
*
,Ï morderto determnethecond1üonsà‘rid
'
-
' _
_
…
sary fôi= 1hegrowtho£ drat0ms Articial
was“
-
biiilt£üÿbÿ
'inïî-di‘jstill‘e'd *Wàtèf the Chemical co—
.
f’
poundsÿknown
after :‘Sëèig 1thàt
,.
j,
idistilledfwater“ Was perfécÿîäùœ. ’Theirñùtè 'ùänësjg.
of
phæphæe;ad
.
a
Thaæiœîm, _
'
-wa$Eà_dded.
rst the results were not 'fav0urable,
_
algad1d not grow ; but;o adding a minute quantity (1 per -
cent)0fnatural
good CultUres were obtained.—
Th13unæpectedl‘esult led to a search for the
.
,
,
bodyWhichmustrexistin the natural Sea—water but not
in:
'
,
_
and Wh1Ch isneceSSar‘y'
',
growth
"
—
;,
'_
‘
' , .W_hätthe substaèe
’
,
butit has î
an @rgà‘ic— compound—thatîS,
something Complex
=
Itappcäars,
_