700 TRAVEL IN EUROPE AND AMERICA. (1880. 
referred to in the glossary and index. I think that 
the analogy of the right-handed screw indicates how 
the world in general regard it, ab extra. There is a 
sensible note on the question in the late Clerk-Max- 
well’s “ Treatise on Electricity,” vol. 1, — the reference 
is not at hand at this moment. It takes, essentially, 
our (my) view as it seems to me; but it refers to a 
similar confusion between the mathematicians and the 
physicists. 
I wish you had gone on to illustrate more of the 
words which have been changed or confused in mean- 
ing ; for example, “ ssiebilbati,  Seving,” ete. 
It is a pity that the terms of nomenclature had not 
been rearranged by Roeper? so as to conflict less with 
those of Linnzus and the general botanical use. 
We have had our centennial of the American Acad- 
emy ; a pleasant reunion. . . 
Mr. Winthrop gave a good godic address. 
I get only slowly on with the Composite ; my inter- 
ruptions and distractions are many and great. For- 
tunately I am in perfect health; am outliving my 
chronic catarrh. I hope you may do so also! 
June 28, 1880. 
Yours of the 15th is duly received, with your pleas- 
ant remarks on my lectures.? Professor Bourier is 
very welcome, and will please me by using any part of 
them he chooses. I should like to see how they would 
read in French. 
1 John A. C. Roeper, 1800-1884; director and professor in the 
Botanie Garden at Bale ; removed to Rostock, Prussia, as professor, 
before 1840. 
2 The Yale Lectures. 
