374 Notices of Boohs. [May, 
the faithful goddess herself has done in the madder-root ; how 
copper exists in turacin, the colouring-matter of the beautiful 
crimson wing-feathers of the touraco, a West African bird, and 
iron in the haemoglobin of the blood of mammals. We also 
have a description of chlorophyll and colein, the latter a 
colouring-matter discovered by Prof. Church in the leaves of the 
Coleus Verschajfeltin. This chapter might have been extended 
with great advantage. A copious index adds much to the value 
of the work. 
