378 B. Silliman—Note to Stimpson’s Paper. 
by the ‘method of mixtures,’ because, as he says, the accuracy 
of this method has not yet ‘been demonstrated by experiment. 
But this objection ceases to have force now that experiments, 
made by Mr. Farmer and myself lately, prove that this method 
is worthy of confidence. Inasmuch as the most important case 
for the use of Farmer’s Theorem is that of gas too rich to be 
burned in the standard burner on a basis of 5 cubic feet per 
shown that the ‘method of mixtures’ was fhe te i! 
am, therefore, glad of this occasion to reiterate my confidence 
in this method, and to refer the reader curious in such matters 
to a brief aper of mine upon this subject, which will be found 
e 379. 
I care very little whether the results of experiment shall 
show, when they are sufficiently accumulated, that the ratio of 
consumption of gas is to the intensity produced as the squares 
of consumption in a given case, or in some other ratio greater 
than a simple ratio. I have desired chiefly to call attention to 
the general untrustworthiness of all photometric observations 
which are made with volumes of gas much less than the normal 
* In the RR POAS of the American Selsey: for Advancement ee ae 
Salem meeting, I presented the matter referring to Sugg’s manipulation 
ferent form, giving rs tonalite of the ober hii with his Argand “ant in 
tabular form as follow: 
Observations Observations 
No. Cubic jcorrected by| Differ- Uncorrected corrected by Differ- 
obs. feet. old rule ences, observations. Farmer’s ences. 
candles. 
14:00 400 14:00 
2 49 13°78 0-2 137504 14°060 0°556 
z 48 13°74 0-26 13-190 14:312 1132 
4, 47 13°30 0-70 12-502 14148 64 
5. 46 13°04 0-96 11°996 147191 2°105 
6 4°5 LE-93 2°07 10-738 13°255 2-517 
The mean candle power of the 6th column is 13-99 candles; difference 0°01 candle. 
The following will show the fractional power required to bring the uncorrected 
observations ‘age 5) to 14-00 candles. 
4-91 13-504 5183: 14°00 candles. 
: 4-gi4i : 13- 5147: 14-00 se 
4. 4°71°85 : 12°502 +3 5185: 14°00 gs 
5. 46186 : 11°9 ee 5186: 14-00 nt 
6. 45252 : 10-737 zat 5252; 14:00 = 
a pr tgruelig goon apes! mig petien: Rarer jenna while the 
2d, 34, 4th and 5th —_* little below chk agiaiece 28 power aad te Oe 
test is considerably 
New Haven, July, ieee: 
