386 
Harris: TERATOLOGICAL FRUITS OF PTELEA 
discontinuity between di- and trimerous fruits, or whether these 
two types are connected by transition stages. 
If transitional con- 
ditions are found their relative frequency of occurrence was to be 
gotten. 
Nine classes of fruits were recognized among twenty-nine 
thousand examined. The distribution of the fruits among these 
classes is shown in the table. 
TARLE OF FREQUENCY 
Number of Shrub 
Cass oF Fruit Totals 
Fee Rabe. akg A ange pee > fal wae Sa Sa cham aU a Oa J 
£, se wing anid developed . —}—!—|] — I r1i—| —|— , 3 
3; mal winged condi- 
peal Tar et Ci ge ARS ae UR adhere a 4,400|1,077\1,797|4,080 2,238/923)|3 960/772!3,257\3,865 2,323 28,701 
3. Third wing present but : | 
less than half developed . 4| 1t0| — 4 3;— 44 1 — 10 36 
ird wing incomplete but a 
over hal eloped. .... — | — * 3 oe I) t— 8 
5. Typical 3-winged condition| 17 a2 2 40 a) ae tap 3 I5 4 197 
5. Four wings, but 2 imper- 
fectly developed. ...... 1} —|— 2s oe —|—|— I 
. Four wings, 1 im- 
perfectl veloped. .... —}| —}| — |} — |— | — | — | — oe 
8. Typical 4-winged ain — 2; —|— ee —il—| — too 4 
9. Pai a on the : 
Oe nd ek — |} ()*}) — |} — (Q”yj—|} —j—-l| — (1) — (3) 
* This pair belonged to class 3 and is counted in with the 1o there. 
It appears that in the individuals examined the anomalous © 
fruits were rare; those with but a single wing occurred in only 
one one-hundredth of one per cent of the cases examined; the 
typical three-winged fruits formed far less than one per cent of 
the series. 
No stress is to be laid on these figures, for the per- 
centage of anomalous organs may vary greatly from shrub to shrub; 
the relative proportion of the different grades of anomaly is of 
greater interest. 
It is quite clear that conditions 3 and 4 are much more rare 
than either 2 or 5, but even with nearly 29,000 observations the 
numbers are too small to determine whether transitional stages 
between trimerous and tetramerous fruits are rare as compared 
with the perfectly developed condition. 
Generally two-winged fruits have two cells while three-winged 
A considerable series of fruits, many of 
them not included in the table, were sectioned to verify this point. 
Incidentally the number of seeds developing was noted 
fruits have three cells. 
