MENDELIANS AND BIOMETRIGIANS 161 



map as very rugged and difficult of ascent, not to be 

 rushed by brilliant cavalry charges, but not impregnable 

 .before the persistent, slow, and methodical onslaught of 

 a courageous and patient infantry ; they are named the 

 hiUs of "' Masked Segregation.'' On the biometrical map 

 they are marked as impregnable, when once occupied and 

 entrenched, and are named " Continuous or Fluctuating 

 Variations," or, in their more recent maps, as 

 " Intermediates." 



The great battle of the future is tnat which will be 

 fought along this rugged range of the " Intermediates." 

 The task of the Mendelian army is to take it. i^nd, 

 aheady in the plains below its brigades are begin- 

 ning to deploy, and are making those initial dispositions 

 which indicate that the assault is being prepared. At 

 the same time, far away on the enemy's flank, in the 

 valleys of Copenhagen, a great turning movement is 

 being developed, and the brigades of the " pure lines " 

 are preparing for their march along the dip-slope of 

 the range, in order to strike the Biometrical army in 

 its rear at the moment when the main Mendelian army 

 unfolds its frontal attack up the rugged face of the 

 escarpment. 



MeanAvhile, along the crest of the range, the concen- 

 tration and entrenchment of the shaken centre of the 

 Biometrical army is apparent. On the right, its wing 

 which defended the village wherein the long tradition 

 that evolution was almost wholly a matter of continuous 

 variation, and that segregation of discontinuous variations 

 played but little part or none at all, has been hopelessly 

 shattered. For everywhere that advancing and ardent 

 left Mendehan wirg has shown the evidence of such 

 discontinuous variations and their segregation in the 

 kingdoms of plants, animals, and Man. On its left, 

 the Biometrical wing has been roUed back, and the 

 position which defended the propositions that problems 

 of inheritance can be solved by reference to one only 

 of the two parents, that the characters of the offspring 

 are determined by the summation in a regular series of 

 ancestral increments, and that an advance in knowledge 

 of heredity can be gained by an indiscrimmate massing 

 together of zygotic characteristics, has been carried by 



