ANAIASKS OF iN>i-:rnrim-:s AND I-TN(;ICIDKS. 



47 



sodium hydroxid and one-hall the sodium rarlx.nate, sinee the .-odium rarl>. mate is 

 rlumvri'd to sodium liirarl>oiiau> (Nall('() s ). A drop nf methyl orange is added and 

 the titraiion rontinued until the appearance of a pink rolt.r. Let this niiinlit-r !' ee 

 IK- represented l>y "in." Sinee this last titration represents the sodium bicarbonate 

 present (.r one-half the sodium carbonate. "I'm" rep resents all the sodium carbon- 

 ate, and "n-m" tin- sodium hydn.xid. 



Theiigmvs in most ea<e> explain themselves, although a f,.\v remarks 

 emphasi/ing certain points might not he out of place. Sample No. i:> 

 is evidently a very pool" example of a soda lye. as two-thirds of it is 

 composed of sodium chlorid. No. !' i> a vei-y fair sample of can-tie 

 soda, while No. IT is a most excellent sample of the same o-oocU. No. 

 3'J is not a j)ota-h lye. as it claims to be, but a soda lye. Nos. 32, 33, 

 and L'4- I cSc \Y are all fair samples of commercial soda lye. 



HELLEBORES. 



TABLE XIII. ( 'oni/inxltinit of ht-fl, -I,,,,;-*. 



Samples Nos. 134:, 154, and 158 are evidently l>adly contaminated 

 with dirt, probably because the roots of the plant were not properly 

 cleaned. Sample No. 155 also appears to have a slightly higher ash 

 content than should be allowed in preparations of this kind. 



MIXTURKS COXTAIXIM; P.OKAX. 



A single example of this class of compounds, the analysis of which 

 was made in this laboratory, is given below: 



HOOKER'S COCKROACH AND \VATKR BH; KXTKRMINATOR. 



(tii'l \\'<ttir 



IVr cent. 



( 'amphor 3. 5-4. 



Borax (Xa,B 4 O 7 10 H 2 O) ^. -'"' 



Ammonia (NH 3 ) .27 



The remainder is principally organic matter and appears to be 

 tobacco. The ammonia seems to be present as ammonium carbonate. 



In making an analysis of this compound the camphor was deter- 

 mined by extracting the powder with ether, allowing it to evaporate 

 at room temperature and weighing at once. While this method leaves 



