... mouth, the proportional length of the eyelids, of the orifice of the nostrils, of the tongue (not always in strict correlation with the length of beak), the size of the crop and of the upper part of ... conviction that the same forms have not been perpetuated since the origin of all things Geoffroy seems to have relied chiefly on the conditions of life, or the "monde ambiant" as the cause of ... by the effects of external conditions, or of habit, or of the volition of the plant itself It is, therefore, of the highest importance to gain a clear insight into the means of modification and...