not be considered significant
but probably indicate variations in the quality of the original lots
used.

Summary

Walnuts husked soon after harvest, before they are completely air-dried,
and stored in moist peat at 1 to 3 deg. C. for five to six months have their
dormancy broken and remain viable for at least three months thereafter.
This treatment is effective for all ten species tested. It is probably
effective for all species of _Juglans_. This method of handling the nuts
has the advantage over outdoor stratifying or autumn planting which
often result in much damage or loss of nuts from the activities of
rodents.

Table 1. Germination of nuts of _Juglans_ spp. after stratifying in
peat over winter, at 1-3 deg.C.

------------------------------------------------------------------------
Per cent germination
-------------------------------------
|Date |Planted in| |Planted
Kind Source |entered|soil in |Planted |in
|in |greenhouse|in field|sphagnum
|storage|April 15 |April 24|June 2
-----------------------------------+-------+----------+--------+--------
nigra (Cornell) Ithaca, N.Y. |Oct. 1 | 70 | 80 | 68
nigra (Cayuga) Ithaca, N.Y. |Oct. 1 | 100 | -- | 80
cinerea--Ithaca, N.Y. |Oct. 1 | 60 | 44 | 8
regia (Sorrentina) Chico, Calif. |Nov. 9 | 66 | 48 | 8
regia (Franquette) Chico, Calif. |Nov. 9 | 80 | 36 | --
regia--Chico, Calif. |Nov. 9 | 75 | 46 | --
Sieboldiana--Ithaca, N.Y. |Oct. 1 | 100 | 40 | --
honorei--Chico, Calif. |Dec. 18| 60 | 55 | 46
pyriformis--Riverside, Calif. |Nov. 9 | 10 | 54 | 31
rupestris--Alpine, Texas |Oct. 1 | 40 | 83 | 50
major--Riverside, Calif. |Nov. 9 | 90 | 92 | 66
californica--Pomona, Calif. |Nov. 9 | 62 | 84 | 91
californica quercina--Chico, Calif.|Dec. 18| -- | 18 | 25
hindsii--Riverside, Calif. |Nov. 9 | 50 | 56 | 52
------------------------------------------------------------------------

References--

1. Brown, Babette I. Injurious Influence of Bark of Black Walnut Roots
on Seedlings of Tom