"92 Correspondence — J. G. Goodchild. 



with Devonian on tbe west of the estuary. The maps bear out the 

 above statements, and will show that the term band was not intended 

 to mean a continuous outcrop. 



Mr. Teall's description of the original character of the Metamorphic 

 rocks and their likeness to Devonian sediments and igneous rocks 

 associated therewith is a fact which deserves more consideration 

 than the writer of the review seems inclined to give to it. As 

 regards my own opinion as to the true boundary of Hope, that 

 would depend on the acceptance of one view or the other, and to 

 the age of the Metamorphic or metamorphosed rocks. Cogent facts 

 are wanted, not opinions, and I am not prepared to enter any horse 

 to win with. Certainly if 1 were I should not consider a plication 

 of such magnitude as to repeat the Middle Devonian at Hope, a feat 

 of legerdemain on the one side, or the repetition of similar conditions 

 of deposit and of vulcanicity in the same area at widely different 

 geological times, an impossibility on the other. 



To be a strong partisan saves a good deal of troublesome in- 

 vestigation. Although no one can fail to see that the acceptance 

 of an ancient series in the extreme south of Devon would be 

 a convenient way of accounting for any extra disturbance in the 

 Devonian rocks, the evidences of such, if present, are insufficient to 

 afford material support to the pre-Devonian hypothesis. 



W. A. E. USSHEE. 



' DEUTOZOIC 

 SiE, — When I used the word 'Deutozoic' I took it for granted that 

 most of the readers of the Geological Magazine knew that the 

 illustrious geologist who introduced the longer (and, etymologically, 

 more correct) term ' Deuterozoic ' had publicly sanctioned the employ- 

 ment of the word in its shortened form. J. G. Goodchild. 

 EoYAL Scottish Museum. 

 January 8th, 1905. 



ON THE TERM 'DEUTEROZOIC 



Sir, — The earliest work in which, to my knowledge, the word 

 Deuterozoic is employed is Page & Lapworth's " Introductory 

 Text-book of Geology," 12th edition, 1888, pp. 132, 133 (see also 

 pp. 127, 129, 179, and 187 of same work). It includes the upper 

 division of the Pal?eozoic, i.e. Old Eed Sandstone, or Devonian, 

 Carboniferous, and Permian. The lower division of the Paleeozoio 

 is termed Proterozoic, and comprises the Cambrian, Ordovician, and 

 Silm-ian formations. 



These terms Proterozoic and Deuterozoic do not seem to have taken 

 hold, and have been neglected and forgotten except perhaps by 

 Lapworth. I do not find any mention of them in any earlier 

 geological work. In Lapworth's " Intermediate Text-book of 

 Geology," 1899, he writes (p. 157) :— 



" By others [i.e. other geologists] the Palasozoic itself is divided 



