100 THE ROYAL SOCIETY OF CANADA 



2. — Chicory {Chichorium Intybus, L) 



Attacked strongly — softened, with brown discolouration and sour 

 smell. Attacks the central portion especially, causing in the younger 

 roots a white surface exudation, 

 3. — Burdock (Arctium minus, Bernh.) 



Fairly old root stocks used and causes no effect except a slight 

 discolouration. 

 4. — Sow Thistle (Sonchus oleraceus, L.) 



Strongly attacked causing a yellowish green discolouration, also 

 very much softened especially in the epidermal and central portions. 

 5. — Canadian Thistle (Cnicus arvensis, Hoffm.) 



Slight grey discolouration and surface growth, with very slight 

 softening. 

 6. — Goldenrod {Solidago canadensis, L.) 



Brown discolouration after 21 hours; after another 24 hours, very 

 slight softening in the centre observed. 

 7. — Aster sip. 



Epidermis strongly attacked and softened, the whole discoloured 

 reddish brown. 

 8. — Ragweed {Ambrosia artemisifolia, L.) 



Destroys the natural pinkish colour of the stem and root, leaving it 

 white with the epidermis discoloured black and softened. The central 

 portion at the crown also softened and the wood unattacked. Peculiar 

 sweetish odour. 

 9. — Fleabane (Erigeron canadensis, L. 



Attacked strongly, destroying the natural pinkish colour of the 

 root. Softens without discolouration all the tissues except the wood. 

 10. — Ox-eye Daisy {Chrysantemum Leucanthemum, L.) 



The central portions softened with slight brown discolouration. 

 11. — Chrysanthemum (Chrysanthemum Sineuse, Sabine.) 



Softening of the pithy centre of the stem, but otherwise unaffected. 

 12. — Wormwood (Artemesia Absinthium, Linn.) 



All blackened and the whole softened except the central woody 

 strand. A slightly older one not attacked so vigorously. The natural 

 smell much accentuated. 



SOLANACEAE. 



1. — Jerusalem Cherry (Solanum Pseudo-Capsicum, L.) 



A slight surface growth of the organism, but no apparent effect 



on the plant. 



2. — Petunia (Pdunia nyctaginijlora, Juss). 



Attacked strongly, particularly the central part of the stem giving 



a soft light-green mass of mealy material — no discolouration. A young 



