616 



passes first through the other hole of the stopper and is carried from this bottle 

 tlirongh an upriglit coiideiisiT, and then nearly to tin- sniiaoe of a small (|iiaiitity of 

 st.uidaid a«ld in an Erlenmeyer liask. Hot air is asjdrated through the bottle con- 

 taining the manure and thence through the condenser and Erlenmeyer flask, where 

 all escaping annuonia is caught and can be determined by titration. 



This method has been ai>i)lied to the drying of samples of horse and hog manure 

 with satisfactory results. 



J)etfniiliif(ti<fii of nitfofien in soils {^\). 3^»3,^{G-^). — *'In view of the fact 

 tliitt the nitrates and uitrite.s are separately determined by more deli- 

 cate methods, and that uothing is gained by the modified Kjeldahl 

 metliod. while many difticulties are introduced by its use. the direct 

 methdd is much t(» be preferred, with a separate determination of the 

 nitrite and nitrate." 



MiscelUoiCDUS <(iittli/sni (p. 3(U). — Analyses (»|' uluten meal, brewers' 

 firains, cotton-seed meal, corn meal, shii» stulf. anthers of corn, and pol- 

 l(Mi of corn. 



SampUnf/ milk {\)]t. 304. 305). — Tests of the fat content of sami>les 

 taken with a di])i)er and of mixed samples of the same milk. 



Some noteworthy weeds. A. X. Prentiss. M. 8. (pp. 300-30S. 

 lig. 1). — l>escrii>titnis of golden hawk weed [Hieraciuni atntnitidvum). 

 lield chamomile (Anthcmis arrcnsis), a n<l beard's tongue (Pen ^v/rw/ww 

 Itiriiinliis.y.w. tllt/itdlis}, with illustrations of the first and tliir<l of these 

 species. 



\'Al{lATloN IN ROOT PRESSI'RE IN DIFFERENT SPE<"IES. A, N. 

 Pim:nt!ss. .M. S. (])p. 308-371. ligs. 2). — "The observations recorded in 

 this article were intended to show the variation in the force of root 

 pressure in ditferent species of greenhouse plants growu in pots and 

 subjected to the same conditions of heat, light, and moisture. The 

 plants were prepared for the experiment by cutting olf the stems 3 

 inches ab(>ve the ground an<l attaching a glass tube to the stumj) ])y 

 means of a piece of rubber tubing, wiiich was strongly wired at both 

 ends. The height to wliich the water rose in the glass tube was sup 

 ])osed to show the relative tbrce of root pressure in the several species. 

 TIh' ]dants were all strong and iiealthy and :i|>parently in a viiiorous 

 condition of growth." 



In the following table the results ot the experiment are sh()\\n. trac- 

 tions being omitted. In file fourth loiiimn the variation in root pres- 

 sure is reibieetl to ei|ui\ ah-nt \abics. the h»\vest being taken as the unit. 



Km 



)>l.llllS 



]<:i1>4:iiii a ... 

 UalsiiiM I.... 

 i{iilK:iiii <• ... 

 JJeponi.a :i .. 

 I5i-j;onia 1> . . 

 Kuralyjilns 



CoU'Us 



Ui-raniuiu . . 



root 

 presbUiv. 



