128 
The practical inference clearly is, that the fewer the barberry bushes in a dis- 
trict, the less will that district suffer from mildew. The -Heidium of Puccinia 
graminis is, however, not confined to the common barberry (Berberis vulgaris ), 
but also occurs upon B. iicifolia, B. canadensis, and B. nepalensis ;* wpon B. amu- 
rensis, B. aristata, and B. atro-purpurea,t and also upon Mahonia glauca.t 
I have been informed that during the last few years the game preservers of 
Norfolk have been rather extensively using some varieties of barberry as cover for 
game in their plantations ; which variety has been employed I cannot say, but the 
practical importance to the agricultural community is considerable. Appended is 
a list of the grasses upon which Puccinia graminis is known to occur. In this 
country, I have met with it upon wheat, on twitch (Z'riticum repens), Dactylis 
glomerata, Poa pratensis, Loliwm perenne, and Avena elatior. 
List of grasses upon which Puccinia. graminis has been known to occur :— 
Phleum pratense Dactylis glomerata 
Alopecurus pratensis Festuca gigantea 
ar fulvus >, Spectabilis 
Phalaris arundinacea 5 tenella 
Agrostis vulgaris Bromus mollis 
5 alba ay tectorum 
Calamagrostis epigejos Triticum vulgare 
Aira ceespitosa sb repens 
Avena sativa BS caninum 
choles Secale cereale 
>, pratensis Lolium perenne 
;,  flavescens Elymus arenarius 
>  élatior mA glaucifolius 
Poa annua Hordeum vulgare 
55 nemoralis Ar sylvaticum 
55 pratensis 8 murinum 
Molinia ccerulea 5 distichum 
Holcus lanatus 
PUCCINIA RUBIGO VERA. 
It has long been known that two kinds of rust affect wheat, one of which, a 
state of Puccinia graminis, has been fully described in its connection with the 
barberry cidium. The other kind of rust is less important to the agricul- 
turist, because it seldom produces any very great amount of injury to the 
corn crop; yet it does do so sometimes, especially when it attacks the ears. 
In a recent article upon the agricultural prospects of the country in one of 
the daily papers, it was said that the red-rust which occurred upon the wheat 
*De Bary, Untersuchungen tiber Uredineen, ii., 1866, p. 207, 
+ Winter, Heawigia, vol. xix., 1880, p. 41. 
t Berkeley and Browne, Annats Nat. Hist., Jan., 1875. 1t was found by my friend, Rev. J. 
Stevenson, at Glamis, Forfarshire ; but he informs me he has not met with it since upon this plant, 
