Additional Notes on the Potato Blight 223 



between this and the tip of the wing ; and scattered over the surface 

 of the wings are a few purple scales; the hind-wings are rather 

 transparent pale purplish. This we call Micropteryx subpurpurella. 

 (There are many species of this same genus Micropteryx, which 

 make similar mines in birch leaves.) The mines in the leaves of 

 oak are so numerous that we frequently find several of the same 

 genus happen to be oak-feeders, and it is by no means uncommon 

 to find that a single oak leaf is mined simultaneously by half a dozen 

 different species." 



ADDITIONAL NOTES ON THE POTATO BLIGHT. 



The following notes are to be read as an appendix to the 

 paper concluded at page 200. They record the results of 

 observation made for the most part since that paper was in 

 type, and which could not, owing to printing exigencies, be 

 conveniently inserted in their proper place. As they record 

 solely personal observations, it seems due to the reader to 

 sign them. Jonathan Hutchinson. 



It is improbable that the attack of the fungus on the 

 flowers themselves, to which we have referred, has not 

 been previously noticed and described by others. As, how- 

 ever, it is not mentioned in any work to which I have access, 

 whilst in several it is stated in detail that the fungus usually 

 gains entrance by the stomata of the leaf, or, exceptionally, 

 by boring the epidermis, it seems worth while to describe in a 

 little detail what I have observed. My first drawings illus- 

 trating these attacks (copied in the plate at page 194) were 

 made four or five years ago, and since then until the present 

 season I have not given much attention to the subject. 

 During the present month (August) I have had a considerable 

 potato plot under close observation. The plants (of various 

 kinds) have flowered freely, and a considerable number of 

 them in the early part of the month began to show signs of 

 blight in their leaves. During the second fortnight they were 

 in full flower, and in a great many instances the flowers 



