An attempt is made to interpret the magnetotelluric sounding curve at Meanook, Alberta, Canada. Records obtained during field operations in August 1961 and magnetograms and tellurograms recorded at the same time at the Dominion Observatory Meanook are analysed by a visual correlation method to obtain apparent resistivity values for periods between 10 and 3000 seconds. Several theoretical layered earth models are considered in order to fit the data thus obtained. A resistivity distribution, obtained from one of the models which gives an adequate fit to the observed data, agrees fairly well with previous resistivity estimates obtained by other investigators. A probable decrease in the resistivity between the depths 90-140km is obtained by this technique. The lack in resolving power of the magnetotelluric method to delineate various layers with moderate resistivity contrasts such as at the ‘Moho’ and at a depth of 90km is demonstrated with the help of a few resistivity models.