POISONOUS PLANTS 313 



Cornevin found by experiment with leaves in autumn 

 and winter that to cause death it would be necessary 

 to ingest the following weight of leaves : 



Horse . . . . 0.2 Ib. per 100 Ib. live weight. 



Ass and Mule. . 0.16 ,, ,, ,, 



Cow. . . . i.o ,, 



Sheep . . . i.o ,, 



Goat . . . . 1.2 



. 

 Rabbit . ./ . . 2.0 



Clippings from Yew trees should never be thrown 

 down where they can be eaten by stock, and where 

 Yew trees overhang hedges near pastures it is advisable 

 to have them lopped back to a distance out of reach 

 of grazing stock. 



Cupressus poisoning has also been recorded, 

 two instances coming to the notice of the Board of 

 Agriculture and Fisheries in 1905 ; the death of cattle 

 was attributed to the poisonous effects of C. macrocarpa 

 and C. nootkatensis. In one instance four bullocks died, 

 and in another three heifers were stated to have 

 suffered from irritant poison, one of them having died. 

 The Board had then no information as to the poisonous 

 properties of the two species of Cupressus referred to, 

 and stated that no record could be found of any 

 similar case which would tend to confirm the suspicion 

 that these trees are poisonous to cattle. 



AMENTACE^: 



The Oak (Quercus sp.). The ingestion of acorns has 

 frequently caused serious losses among young cattle up 

 to two years old, as in 1808, 1870, 1884, anc * 1900. 

 Cattle over three years old were seldom affected, while 



