123 
occur both among those killed outright and among the severely 
winter-killed. This indicates individual differences. 
There are still other plants in the collections where the evi- 
dences of the past winter are now wholly obscured by the fact 
that the injury was slight and the vigorous growth of this season 
has repaired the damage. They are listed here as plants only 
slightly winter-killed at Brooklyn. 
SLIGHTLY WINTER-KILLED 
Pinus koraiensis, Picea excelsa, P. pungens glauca; Celtis au- 
stralis, Celtis sp. (Wilson No. 343) ; Berberis aristata, B. sinensis, 
B. canadensis, B. aggregata Poiretii, B. Julianae, Calycanthus 
occidentalis, C. fertilis; Philadelphus Lewisu, Philadelphus sp. 
(Purdom No. 818); Ribes virguum, Eucommia ulmoides (ad- 
joining specimen untouched), Exochorda racemosa, Rosa gallica 
centifolia, Rosa sp. (Purdom No. 635), Rosa rubrifolia; Spiraea 
Henryi, S. concinna, S. Bumalda Anthony Waterer, S. Marga- 
retae, Ilex Sieboldii, Euonymus nana, Acer palmatum ornatum, 
Halesia carolina, Lycium chinense, Vitex Agnus-castus, Ligu- 
strum media, Symphoricarpos occidentalis, Viburnum theiforum, 
V. betulifolium. 
In the Recorp for July, 1918, was recorded the loss from the 
winter preceding that, and from that note we take the following 
tabulation, adding the records of loss for the winter just past. 
SUMMARY OF EFFECTS ON SPECIES AND VARIETIES OF Woopy PLANTS OF THE 
WINTERS OF 1917-18, AND 1919-20 
1917-18 IgIg-20 
Killed-.outnichtere ar ean eee PP ti ssetels 28 31 
Severely winter-killed but recovering .......... 90 65 
Slightly winter-killed ..........ccesseseeeeeees 28 34 
Further reference to the former article should be made for the 
effects of the two winters on identical species, the variations of 
which are not easily explainable. Undoubtedly some of our re- 
cent loss is due to the inability of many plants to recover from 
the 1917-18 winter. Although their obvious response to it 
seemed favorable, it is quite likely that they were so weakened 
that the 1919-20 winter proved too much for them. 
| NorMAN TAYLOR. 
