285 
of all, while mis the number of observations, we obtain 
plus or minus .3%, as the probable error for any single ob- 
servation of a similar kind. Dividing this result by the 
square root of the number of observations made in any series 
will give the probable error of the final result, or average of 
DETERMINATION OF MOISTURE IN FRUIT. 







pwfarap Sickel Su biden 
A | dod |B] © 
+2 w a te my o oo 
Date. VARIETY. a | hts/e2| 2a 
SH Mi SS | Bo 
D o ls mE 2° 
BBall 
July i1)Pear—Bartlett... 2... .0 0.66. weewes 52.2 {11.5 | 2)79.7 79.3 
im 4 MMC e ior cael Pat jel icy acc ...-| 62.58/138.2 | 2)78.9 ; 
o MEAEROCK CIS Foie ti sae tag twee oe . | 23.46) 5.33) 2)77.3 (a 
‘i ‘i SECEDE oAnTae MTSE ee we Weal} 19.05} 4.44} 276.7 : 
te Bet GMIBN BeEBUtY iiss. wis sv whlen « 34.9 | 7.67) 2/78. 755 
* it ie ah bai ik ic. a'iat ahd ty el hate an Bb a ; 
COPE AS ETHEL NA RES Re Aaa Oe 20.98) 5.2 | 2.75.2 (49 
re nt his itd GOs do a 24.4 | 6.25) 2'74.4 ; 
AUgmeoe ne oarbleteys Pgs.) 8 Palit \Erase 213.5 |42.14) 280.3 ( oo 4s 
x " A WGERSERE GRMN ee eT sla es 201.65/39.03] 280.6 
Adga0s:9*" Flemish Beautys 2.2L 0 117.96|19.78) 2.83.2 t 83 4 
a a ¥ iM Sm Be ee, ee 115.6 |19 2/83.6 i 
sh Seems SOCK GL. 11th LNW ehessid o's 58.76/12.22} 2'79.2 
_ 4 he Me PR Di at ano hog ot 54.42)11.03) 279.7 (4 5 
Es sf PT MM ARE EPR ange! ts 6423 113/38) 2179.3 [ 
fy “ IR ree. eed ule 60. 12.1 | 2)79.8 | 
a = TRUSTe yen GON 12 0 Boks © eee a ae 79.45)17.21) 2)78.3 | 
4g ? PINUS, Bp. 8 8 YEN) Se 74,28)16.03) 2,78.4 
“ * AA OS eins ete a 73.34/15.75| 2,78.5 | 
i a 1 Sharpe at beh den See aap 63.2 |18.5 ; 2/78.6 
FS a ee 3 Re Ma a2 ee TOV MGI NT Se7 | 
at ay aa ant (Len? Sete. oxia.bane Jet 82.07|17.35| 278.9 | 
of . NS TT S| 3 Ba | a 78.82})15.5 | 2,79. 
4 ey CR ARS RIE RK 74.41115.55) 2/79.1 ! "9 
4 4 potty epee al Sh epg eld lice 70.3 |14.69] 2)79.1 ( ~~" 
a “ Rhy Sep ROARED ARR 66.46/13.9 | 279.1 
A : * Supt Ge) ENS fe Rae CL Ngee Bel 75.3 ,15.73| 279.1 | 
ff if eid: ai! u's  baetreevach Tey 69.58)14.5 | 2.79.2 
<t ‘s IO ae RIESE ISTORROAGN URE es 81.6 |16.86} 279.3 | 
+ Ay ai PN PR ag Pe aka? 64:18)13.1 2.79.6 
i fs pga enh ele ha Wise Nod ut pate ge 65.74/13.37 279.7 | 
i Ff Bei gh be tie ore eno a tk ab Raa 64.54/12.95| 2179.9 J. 



the whole for any similar set of determinations. Thus the 
probable error for the average of 79% in the sixteen deter- 
minations of the water in Buffum pears is plus or minus .3 
divided by the square root of 16 = plus or minus .07%. 
This shows that the error in the table of percentages of 
water in pear fruit, that may be ascribed to imperfect 
manipulation, defective apparatus, the personal equasion, 
etc., is very small, not exceeding three tenths of a per 
cent. between any two single determinations. The per- 
