ee yt sin : i pee tea aaa vont asin i 1 | ae Laan} ie 
J AON Mag) ioe “ fe? el eae . ‘ 
ies * / es cichi atean . \ 
vat yf , t ' ‘ 
oe Ate 
* : 
+ : 
> No. 33.] | 165 
- ganic substances is all transformed into ammonium sulphate by this 
z- treatment, and it only remains to distil the solution with excess of 
alkali and determine the ammonia in the distillate. 
‘ The green solution, after cooling, is diluted with water, when it 
_ changes to a brown color. It is then transferred to a flask of about 
\ three-quarter litre capacity, containing a few small pieces of zinc. The © 
zinc causes a slight evolution of hydrogen during the distillation ‘with 
alkali, and thus prevents bumping, which would otherwise be so vio- 
lent as to render the method impracticable. Forty c.c. of a solution 
of caustic soda (sp. gr. 1-30) is added to the contents of the flask which 
; is immediately connected with a condenser and rapidly distilled. The 
L distillation proceeds quietly and is finished in ten to fifteen minutes. 
The distillate is received in a flask containing a known quantity of 
standard acid and is titrated with standard alkali. 
| The method is very economical of time, as many as twenty deter- 
minations being readily made in a day. The saving of combustion, 
tubing and gas is also quite an item. The method seems to be accu- 
rate. Determinations made by the author in a great variety of sub- 
stances gave results which agree very closely with those obtained by 
combustion with soda-lime. ‘The author recommends the method for 
d organic bodies in general, excepting only those in which the nitrogen 
occurs in the form of volatile acids. While it would be expected that 
nitric acid would be, in great part, expelled by heating with a large 
excess of concentrated sulphuric acid, he found that in the presence 
of organic matter the nitric acid was largely converted into ammonia. | 
Determinations made in the station laboratory of nitrogen in coarse 
fodders that had been previously analyzed by Varrentrapp and Will’s 
method, fully confirm the conclusions of the author, and there is little 
doubt that it will prove a great aid to agricultural chemists. The re- 
_ sults obtained by both methods are given below. The determinations 
with soda-lime were made six months before those with the new 
method. It is, therefore, probable that the difference in the two 
methods may be largely due to the sample examined. 
Soda- New 
lime. method, 
EEL Ty ete t. coe win! ot ho: seston! a Alalw al eilg'a% & ecaielerete = af al 1.36 1.34 
RRR Mic alsipricarere ci alakese Sigg! a's ip. dla Meet sei late! Sie co oe Tdi E38 
ty thio a well seco aon eo glel wie dy Solas as als ob bi lave ¥id era's LLL 
eX ee earch Woy iuidd sich e atlare Zjaleig aia ¢ deaieiy y aacel LEIA 
ETM ete ar shots ek cetera this Sin iayhral sialrath kel acini Kina: ERG chi ey 
ni cs erate: shave Wiles Ska ea stk mya oe: vw cosets alg nk SAG ee LS Me 
SMT is CRS seIeY. Voe hee NNT Vik Aida alow jeg neha wee ates ats tds 1.57" 1,56 
st MNES a tnt fotat n'a tle cial a's, mo hy 6 #8; 6 aie Wiese inje cise ece to's 1.46 1.51 
Sd eng Si DINER 2 OU Nd Soh SOR AR ea 7 Op aM a L257: L249 
Sac exs oi ee sly cits, So's d vie eo Gola ee asl Pd wa te eee 1.45 1.51 
SR ew Sal epein Wiehe Vietsldiaic s Ce eas ome uie eBoy soles oe 1.93: 4296 
MP a tered Vadeig ts oc iii e nyl” tg diets gic arse eS hiepyie she, eiece bate BY oops SCY 6") 
MIE, Poth aY. AEVE AR Sack Chis yard te ead) aude Eid Siete, y's eile he 8 1.95 4.96 
1.66 
Re Bereta ies ata g Sad) c aceh titra 'e ais ew nis ol etb do's sess 1.65 
4. Hther extract. 
A filter for obtaining the ether extract is made by blowingasmall | 
hole (three millimeters in diameter) in the bottom of a test tube, ten 
