33 . 
Cubic centimeters of oxygen developed by various fruits, ete 
Minutes. 
5. | 10 | 15 mm 
| 
Orange (Citrus aurantium sinensis) ......20..00000 00+: ee Lo) CRP oe 
rere ons oe eee eee ‘redide ) koh ose 
Riedie pet A258. Eee ek, «ae Weegane | -.4.0.|!--70 2. 90 ee 
Lemon! (Citrus medica limon).........----22--++++- soy nan geumae GUMiiear | eae a] cS 
Ss Ce PE 5ec je eee Weel as | ast 
Banana (Musa sapientum) ........-..2.-20000e00eeeeee- {Residue ..| 63| 100| 180} 440 
ce ere ie a {Resiiue..| 400| 72.0| 870) 960 
Apple, sour (Pyrus malus)........0220.202sceeeeeeeeee feadane b> 30) 301. eee 
Ret Baece 2 a oot 2 ae ie tecdy See Agate |: 23) ee cael eee 
a ee a ce ee ee ee lnosdte | no koe 
Rople peck; subncit 2 honest. 2 el hee ac. reais. | tab 96.01. alo eee 
iyple woods. S ene ee RS OS {Resine | 1100 | 1680 | 22802... 
Pear (Pyrus communis) © <2 o2) poo cec sei --- \Reaaue.|-2.0|- 9001 ac ocemeas 
Peaipedt jf ok ca eee eet ptP ncn 2 ot {Residue..) 62.0| 910 10L0| 1040 
Date (Phoenix dactylifera) -......-2--<--2-200e0ceeeeeee Pee | eet ie | ee eee 
Strawberries, sour (Fragaria chiloensis)...............--- Coe | cel. ia en 
Strawberries, neutralized ....-..-.2--.-c22-20-200te0eeee feeecue | 2b]. 32 |e 
Onion, bulb (Allium cepa) -....-...2-2+-20e2eeeeeeseeee \Readue.| 210| 870} 620 (2.22. 
|, Sor ee ae eee eee eee ees {Residue ..| 91.0| 140.0| 189.0 (2.2222 
Potato flesh (Solanum tuberosum) -----...-..-..-.......- { Ae een = | Beh ve pay 
a ieee emma e f eE o {Residue | 730| 940] 1010} 120 
1 The lemon juice neutralized by carbonate of soda weiied Bee aaa a iiotianuseek 2 
: ioe detent rons apple seed developed 552 cc. oxygen in forty-five minutes, the residue 379 cc. in 
We learn from these determinations that the flesh of the fruits 
when of an acid character is poor in catalase and that at the same time 
the seeds may be very rich in it. Compare, for instance, the above 
data for apple seed and apple flesh. It is true that a better result is 
obtained after neutralization of the acid, but even in this case the cata- 
lytic power appears small. Compare, aiso, the data for strawberry and 
lemon. Evidently the accumulation of acid kills the enzym. We 
notice further a relatively large amount in the fatty seeds, but in 
starchy seeds only the sweet corn and chestnut are noticeably rich in 
catalase. Relatively a very large content of /-catalase is observed 
with seeds of poppy and clover. Turnip, radish, and rape seed, while 
rich in @-catalase, are exceedingly poor in /-catalase. During ger- 
mination the total catalase is very much increased, as observed with 
barley shoots about 5 cm. long. Twenty grains yielded in twenty 
minutes 30 ce. of oxygen, while twenty shoots from the same lot 
yielded fully 130 ce. 
15253 3 
