GAISER: CRYSTALS IN THE SPADIX OF ANTHURIUM 397 
still in evidence in a thin primordial utricle not only in this 
species but in the others mentioned earlier. In these forms 
there is certainly no evidence that the nucleus ever forms the 
centre about which a stellate group of crystals develops. 
In conclusion I wish to thank Professor R. A. Harper for 
his suggestions and careful criticism of this work. 
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