lographic traces of compound action potentials obtained under experimental conditions identical to those of the up* per portion of Fig. 2, except that the ganglion had been superfused for 24 minutes with 5 vnM theophylline.

100 Tim VETERINARY RfcCOtlt) JANUARY 22nd. 1972 Letters Tlio Relationship of Serum Calcium to X*rolnpsetl Vagina aud Hingwonab Sir,--Wc wore interested to read the paper by Mr.

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