84 
the cortex of the host plant they appear to derive all food 
materials they obtain from it by simple osmosis. There is no 
fusion of the cells of host and parasite. The hailstorm never go 
in as far as the wood. The wood is the channel of transference of 
water containing the organic constituents of plant life and the 
cortex and hast the means of transference of elaborated nitro- 
genous and noil-nitrogenous organic food materials. The conclu- 
sion is that the main object of the parasitism of Nuytsia is to 
obtain an additional supply of organic materials, including* nitro- 
genous substances. 
Fig. 10. 
Transverse section of haustoriogen attacking a root of Hibbertia 
liypericoides. 
a, wood of host; b, cortex of host root ; C, of 
d, haustorinm in early stages of attack; e, liaustorium in complete contact 
with cortical cells of host, root; f, indications of vascular bundle of the 
haustoriogen; g, part of vascular bundle entering haustoriogen; h cor- 
tex ot root from which the haustoriogen has arisen. 
Tn contrast to this is Nuytsia *s close relation, Loranthus the 
Mistletoe. Here we have a plant parasitic for water and salts and 
quite well able to provide all the organic food materials it needs. 
