DIATOMS. 



• H. \j. Smith is well known as a most • niiin-tit COllectO] and 



student bf tin- Diatomac< re. [Recently he has added to l»is own coll 

 that of the late I >r. De Brebisson. 



Be is dow engaged in preparing a series of slides with the auth< 

 names of De Brebisson, and other authors. This series of 400 I 

 slides will be the standard authority for time to come for i] 

 nomenclature. 



Subscriptions for the series, in boxes of 50, will be received by the 

 subscriber. 



CII AIl^lilS STODDER, 



Sole Agent for Tolles' Microscopes an 1 Teles* 

 MM l)e\ ousliire Street, Boston. >I;in* 



DIATOMS!! 



Beautiful Slides, by new process, from Virginia, Maryland and California. 60 

 cents each; four for $2; six for $2 50; postpaid. Circular* free. See Am i 

 sjtal or Micbosoofx fer February, 1877. 



C. L. PETICOLAS, 635 8th St. North, Richmond, Va. 

 The following extracts from a few of the letters rec iv< d by me will t-how the 

 opinion of judges in regard to my preparations: 



Trot, N. v.. Oct 28th, 1876. 

 Dear Bib— Much obliged for the excellent alideof Richmond Diatoi 

 I cannot nay less than that it surpasses everything < t the kind I have heretofore 

 seen. It is an exquisite slide; in richness of material and success in cleaning 

 and mounting, it is every way notable. R. H. WARD, M. D„ 



(Editor of Microscopical Department of the " 



NXWABK, N. -J. 1 



" I took the three beautiful slides — Nottingham, Petersburg and I 



sent me, to a meeting of our Scientific Association, where thej were much 

 admired.'' Yours truly, A. MEAD BDWABD8, M, D. 



Philadelphia, 8—4, II 

 •• These (slides) are the very finest specimens bf Richmond earth I ha\- 

 W. B. WALM8LE1 , [of J. W. Qoee 



NEW MODEL MICROSCOPEST 



se Microscopes, which have been perfected under the direct i 

 ablest mioroscopiata In the United states, unite stability, tirmn. - 

 compactness, with as great simplicity of construction as (a compatible with the 

 purpose for which the instruments are intruded, and tor efficiency, conTenienoe, 

 .they will compare favorably with any microscope now m 

 market The] srs manufactured i>y the itanseh a l.oml) Optical 

 < oiu|»an>. under the direct superintendence ol Mr. i. Gfcnndlach, formerly 

 ..i Berlin, * i so well known among microscopists. The pri< 



Instruments will be found very moderate, even when compared with the 

 Itngly low rates at which micro-copes In general are • selling. 



They range In price from $'j<> to $300, and all ha\e the standard t 

 The objectives have received the highest praise from everj no 

 that has examined them. A fully Illustrated oatalogue s» at free to any s 



BAUSCH & LOMB OPTICAL COMPANY, 



37 Maiden Lane, New York. 



