258 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY* 
The rugosa Roses have long been eminent for their thick leathery 
foliage, but hitherto the results from crossing this group have not 
yielded very shapely flowers, although some grand decorative kinds 
have resulted. One kind, R. rugosa ' Georges Cain,' possesses such 
fine foliage and good deep petals that I strongly advise raisers to use 
it as a seed parent. 
Another tribe, namely, the Hybrid Musks, seems to me capable 
of producing good mildew-proof Roses. 
One kind, namely, ' Trier,' has been used, I believe, by the Rev. J. 
Pemberton as parent for some of his interesting novelties, such as 
' Danae,' ' Moonlight,' &c, although I have no authority for saying 
this. 
' Trier ' is mildew-proof, and was raised by Lambert from ' Aglaia ' 
X ' Mrs. Sharman Crawford.' Here we see the influence of the 
mildew-resisting seed parent ' Aglaia ' overpowering the badly-mil- 
dewed parent ' Mrs. Crawford.' 
' Aglaia ' emanated from R. polyantha X ' Reve d'Or,' both mildew- 
resisters. 
' Trier ' has produced ' Adrian Riverchon,' a fine single mildew- 
resister, and is capable, in my opinion, of giving us many very lovely 
perpetual-flowering mildew-proof shrub Roses, for we cannot term 
them Climbers or Ramblers. 
In a paper on this subject one is handicapped by the reticence 
regarding parentage adopted by our Irish and other Rose-growers, and 
I could wish the task had been deputed to one of them to write it, 
for they could, if they would, throw much light upon the question of 
mildew-proof novelties, but I am convinced myself that in order to 
obtain more mildew-resisters we must start right with mildew-resisting 
kinds. And I cannot help saying that a trial garden should be 
established by the National Rose Society or the Royal Horticultural 
Society, where experiments could be carried out by capable raisers, 
who would be able to devote more time to the work than the grower 
for sale can possibly give. 
We see this accomplished in a small way when we remember the 
results achieved by Dr. Van Fleet in America and Dr. Williams of 
Harrow ; and I wish, as the result of these somewhat disjointed 
remarks, I could induce other private gentlemen or ladies to take 
up the work, which is full of fascination and capable of wonderful 
results. 
I append a list of certain varieties I have found to be more or less 
mildew-resisting. This list, taken from the " Rosarian's Year Book " of 
1 91 6, would take some time to read, and Fellows will be enabled to 
scrutinize it in the Journal of this Society. 
Perhaps before I sit down I might just say to any novice in Rose- 
growing that mildew is largely engendered by errors in cultivation, 
such as overdosing with chemical manures, watering with garden- 
hose, and soil too porous, all producing a softness of foliage that 
makes it a prey to the fungus. 
