252 MAINE AGR1CUI.TURAI, EXPERIMENT STATION, I914 



Fig. 85. A similar section showing a portion of a black spot on 

 a white shank. The spotted region (the upper right 

 hand corner) of the epidermis is thickly supplied 

 with melanin pigment granules in both layers, and 

 sparsely with melanin pigment cells in the rete layer. 

 The latter are present in the corium, in large num- 

 bers in the spotted portion. There is no lipochrome 

 pigment. 



Fig. 86. A similar section showing a portion of a black spot on 

 a yellow shank. Lipochrome pigment is diffused 

 through both layers of the epidermis. The spotted 

 region of the epidermis (upper left hand corner) is 

 thickly supplied with melanin pigment granules in 

 both layers, and sparsely with melanin pigment cells 

 in the rete layer. The latter cells are present in the 

 upper corium, in large numbers under the spotted 

 portion. Lipochrome pigment is wanting in the 

 dermis. 



Fig. 87. A similar section through a part of a black spot on a 

 blue shank. The spotted region of the epidermis 

 (upper left hand corner) is thickly peppered with 

 melanin pigment granules in both layers, and 

 sparsely with melanin pigment cells in the Malphi- 

 gian layer. The latter cells are numerous in the 

 upper corium. Lipochrome pigment is wanting. 



Fig. 88. A vertical section through a blue spot on a white 

 shank. In the spotted region melanin pigment cells 

 He thickly in the upper corium. Lipochrome pig- 

 ment is wanting. The epidermis is unpigmented. 



