MI.STUY. 





by the growing plant for nutrient material, 



',, i, Ordlltarilj .trai, fr ..M, MM .: I 



Th, ,jU,-V.. !. .-f BJIMPPJ ! V. | .!. I A- 



IMB tfvtiteted r.> IT ' i . : I- 

 laurent ano BohloMtac* MM! Koob a?yi Kornv 



'.-, ,..-.?. 



-. ; MTJ 



M : | .-... 



to determining whether alga* in 

 set* the power ..f a~imilat<i, K > fr,, 

 nitrogen or not. Having suooeeded in 

 lafaafaafk ipeotoaof algalnastat .f , .- .-. 

 aeyst oooeoui -be placed a in a nu- 



i,,,,', feu from n.trv.v it Ballad >sJ BJ 



sign* of growth. i>n adding nitrate* 

 sand, it grew rapi.liv till the added i 

 were exhausted, and then stopped ; UM a*l 



rt gave no result, but 

 - the merest trace of 



growth immediately ensued. The 



of very different specs**, (Vat from 

 chlorophyll, and capable of faxing mtrogea, 

 rtan bacteria of the aoll Tb/aa- 



tfti JJlsTl B*H tftasBBBBBV l*Is*\fflfa% ttratasl ausi s*\slns1feaw*msY *n 

 trf t^stlfta? ttl*%i A iAinaWl lkV tlaa> aMffftafM ats***! kw) 



ranihlng from UM dacom insi lion of UM 

 pneric carbonic anhydride ami au r It t 

 ' * 



neh * su*nff oe **<*rtn afWl liW*K in 



war art as food for micro-or 

 bring, to Ax nitrogen it to 

 kWj M svJtabl : 



. h tad .. .-.* f-.- ajM pni PJ 



in nutriUve e*uUure* cooUininf soil 



kind*, arranged in pairs, beta 

 ban of each mole having Identical cone 

 except that in the one a small quant 

 tfaxtrost) WM added, while in the other no or- 



varioo*, some of t he ate Axing nitrogen 

 cultures whether with or without cugar and 

 some only in the cultures containing 

 while, generally. UM activity wa* lar* 

 creased in UM sngar-contaiaiBff cultures, 

 all the experiment* UM oontimsions are drawn 

 that at lea*t two alga* cyst ococcus and sticho- 

 ooccus possess no powers in them- 



selves: that many algv, taken together with 

 >^rganiains of UM toil < 



lances to contain some little 



nous matter in order to give tne lower orgaaisass 



ritalhy necsesmi 



: | f fr,, , .T |i I: ' 



ground to occupied. In agriculture tb. 

 to be aimed at to to cover the soil wita 



luiunant in its vat 

 rate all the rainfall. Tbe loss of nitrogen 

 pounds to regulated, not by UM 

 the drainage, but by its 



te ranace. ut y u aonaacw. 4 

 n dUaW in the aoO to either aarii 

 or loet. ThtM. whan UM crop to avail UM fanner 

 to doubly mjuml-by the deficiency of UM prod- 

 ocU obtained and bjtoe mpovwUuMBt of ato 



the power of amimilating organic nitrogen ; and 

 that thto power to much incwaard by the a.l.li- 



Uon of such organic substances as sugar. The 

 experiments of Uurent and Schloesing hsd 

 showed that if in a culturr of alpr and bacteria, 

 endowed with -fixing** powers, the alga) were 

 destroyed. UM bacteria lost some, if not all. of 

 this cat Mint > whirh the mixture bad possessed; 



!:! !h-' <-\|- r: ::.,!i ', . f I '. r }.,'..'.( i .'.': r . ;if i 



Drouin had shown the importance of organ ic 

 compounds to nit nH, m snob observa- 



tions as these K h .o t) < lu.le* that the 



i^hip which the alga) bear to the micro- 

 organisms to one oonnected with the orpin ir 

 hese latter: and that the alpr. 

 iMU-teria. ajimi- 



irbobytelt material. |*rt of which goat 

 nice, l.ut |rt also to that 

 -o-organtoms. Tbe relation to tbere- 

 f 



'i each supplies the want* 

 Tne conclusion* ,lrw bv M. 



i 1 . Iyerhas made a series of 



nxi-rap- *n,lity of the root sap of about 

 .nt* in order to measure the power pos- 

 sessed bv plant* of dishing the mineral 



ic add as an analytical soil solvwt. Tbe 

 of thto solution on a number of UM Rota- 

 >ito was therefore tried. Tae 



comparative fertility of UM soil to Jaataii 

 obtained by the use of saoh a i 



of from 10.000.000 to tO.OOQ.000 mi- 



hi* rrwarrhc* on assimilable 

 trannfonnation* in arable land are: 1. that 

 abundant rain* may carrv off from rich soil* 

 QOOalderable an-. -'. that 



plant* ^-r.w.Hk: 01 thl lOfl IM ll ' Bfl 

 tbtokw: 3. that carbon dUulphide am* 

 action of the nitric ferment temporarily wtta- 

 tmmonfcceJ formtoa 



