4^4 



CORRESPONDENCE. 



Is Wachsmuth and Springer's Crinoid-Monograph Published ? 



Are you not in error when you state, as you do in your May number (p. 359), 

 that " Wachsmuth and Springer's Monograph of the Crinoidea Camerata of 

 N. America will not be published before August " ? You can hardly be aware that a 

 review of the work, by Charles R. Keyes, appeared in the American Naturalist for 

 April (pp. 291-295), and stated definitely that the Monograph was issued, even giving 

 1895 as its date of publication. S. Bergman. 



[This is an interesting question. We are well aware that Mr. Keyes has 

 reviewed the Monograph in question, not only in the American Naturalist, but in the 

 Journal of Geology, Chicago; further, that he has in both these places, and 

 also in the American Geologist, given the date as 1895, and quoted the actual 

 number of pages and plates. Nevertheless, our statement was based on authority 

 no less than that of the surviving author of the Monograph, and we still believe it 

 to be correct. Mr. Bergman must get his explanation from the Editors of our 

 above-mentioned contemporaries, for whose methods of reviewing we are not 

 responsible. — Ed. Nat. Sci.] 



A CORRECTION. 



Mr. H. Hanna asks us to state that in the Editorial Note on " Preserving 

 Fluids," on p. 294 of our May number, the words " 10 per cent, solution of chromic 

 acid " should be " 1 per cent, solution," etc. 



NOTICE. 



To Contributors. — All communications to be addressed to the Editor 

 of Natural Science, at 22 St. Andrew Street, Holborn Circus, 

 London, E.C. Correspondence and notes intended for any particular month 

 should be sent in not later than the 10th of the preceding month. 



To the Trade. — Natural Science is published on the 15th of each 

 month ; all advertisements should be in the Publishers' hands not later than the 

 ■20th. 



To our Subscribers and Others. — There are now published f Eight 

 Volumes of Natural Science. Nos. i, 8, 11, 12, and 23 being out 

 of print, can only be supplied in the set of first Four Volumes. 



Price of set of Vols. I., II., III., IV. 



„ V., VI., VII., VIII 



„ „ „ i--viii 



It will shortly be necessary to raise the price of Vols. I. -IV. still further. 

 Nos. after 28 (June, 1894) can s ^ ^ e supplied at One Shilling each. 



