text:  Whether he considers the data too imperfect or is afraid of trusting himself with any decided expression of opinion on a subject which has been so obscured by charlatanry and which is open to so much misapprehension does not appear; but it certainly is an apparently striking defect that where a large portion of the work is devoted to the explanation of the different forms of the cranium in the inferior animals and in man and to which the largest portion of his pictorial illustrations apply he should give us so little insight into his opinions as to what extent phrenology is fairly entitled to credibility