214 



THE AMERICAN MONTHLY 



[November, 



being the wife of an able zoologist 

 who has been a Naples worker, her- 

 self is an able student of zoology, hav- 

 ing studied in this country, in Cam- 

 bridge, England, and at Naples. 

 The article is of great interest, as is 

 every fresh word about that most in- 

 tei-esting place. The other article is 

 by Ernest Ingersoll,* descriptive of 

 the American Station at Wood's Holl, 

 the summer headquarters of the United 

 States Fish Commission. This, under 

 the direction of Professor Spencer F. 

 Baird, has become the most com- 

 pletely equipped enterprise of its kind 

 in existence, its object being the study 

 of all that relates to the fisheries. Be- 

 gun in 1S76, it has grown in strength 

 and efficiency until it demonstrated 

 its value, became an object of envy 

 abroad, and is now being followed by 

 the English, who are establishing a 

 British Commission with a similar 

 purpose. 



Besides the two laboratories, we 

 have on our coast every summer the 

 laboratory of Professor Hyatt, at 

 Annisquam, on Cape Ann, for begin- 

 ners in zoology as well as all who 

 wish to go ; Prof. Agassiz's labora- 

 tory at Newport, R. I., restricted to 

 the use of a few naturalists, and the 

 Chesapeake Zoological Laboratory, 

 under the direction of Prof. W. K. 

 Brooks, of Johns Hopkins, for the 

 use of advanced and special students 

 in zoology (or botany if they wish) . 

 The work of all these sea-shore lab- 

 oratories each summer adds much o f 

 importance to our knowledge of 

 American Atlantic marine zoologv. 



Desmid Material Wanted. — 

 We are in receipt of a letter from 

 Mr. J. Harbord Lewis, F.L S., 

 of 145 Windsor street, Liverpool, 

 England, dated 35th October, 1SS6. 

 The letter is evidently intended as 

 a personal communication to Prof. 

 R. Hitchcock, the writer not know- 

 ing of his absence from this country. 

 The writer encloses an advertisement 



* See Harper's Weekly, vol. xxx, Oct. 2, '86, p. 635. 



of fine mounts of British desmids, 

 which he ofters for sale at prices 

 varying from 4^-. to is. ^d. He is 

 anxious to obtain American desmid 

 and filamentous fresh-water alga 

 material, and ofters to make suitable 

 return in slides. ' Materials may be 

 in the rough , just as gathered ; and it is 

 advisable to have exact locality, date, 

 and the preservative used, for sake of 

 reference, in case anything good turns 

 up.' Since the offer of Mr. Lewis 

 was intended for Mr. Hitchcock, who 

 has studied these plants very fully, we 

 do not wish our readers to understand 

 that everN'one is requested to exchange 

 on the terms mentioned, but we sug- 

 gest that any desmid collector who 

 desires to improve this opportunity 

 confer for himself with Mr. Lewis. • 



o 



Appochromatic Objectives and 

 Eye-Pieces. — The price-list of the 

 new Zeiss Objectives and Eye-Pieces, 

 from selected glass of the Technical 

 Glass Foundry (Schott & Gen) , Jena, 

 Germany, has been handed to us, and 

 we quote a few of the prices men- 

 tioned in that list : 



Dry System, .30 ap., 25. mm., i in Mk. 140 



" .30 ap., 16 mm , ?g' in Mk. 100 



" .60 ap., 12. mm , )^ in Mk. 170 



" .95 ap., 6. mm., 3^ in Mk. 220 



Water Immrs., 1.25 ap , 2.5 mm., 'a in Mk. 300 



Homog. " t.3oap., 2. mm., 15 in Mk. 450 



The prices of the eye-pieces vary 

 from 20 marks to 40 marks. 



The price-list is issued by F. J. 

 Emmerich & Sons, 138 Fulton street, 

 New York city, who reckon the 

 mark, adding duties and other ex- 

 penses, at 37^ cents. 



The original price-list of these ob- 

 jectives, issued by Zeiss in German, 

 is a valuable document, as it is full 

 of information for the microscopist. 

 A full translation of the article is 

 given in the current number of the 

 Journa;l of the Roy. Mic. Society. 

 We shall include an account of this 

 article in our December number. 

 o 



Typographical Errors. — We 

 take the present occasion to correct 

 two bad tvpographical errors which 

 have appeared in the yotirnal, and 



