EXCHANGES. 



(Exchanges are inserted without charge. Subscribers having microscope apparatus for sale or 

 exchange can announce the same without charge. ) 



T70R SALE OH EXCHANGE.-Green and blue stains for lOcts an ounce. Sections of wood. 

 r "various kinds from l-50uth to l-l50Uth inch thick for lOcts. per dozen. ^^ uberty< p a 



RIFTED to exchange a Seller's section knife carrier 0}^ fo^ajood^m^ 



-i-rrniTT n like to cxchanee a 1-6 in. object, drv, 160= for a first-class microtome. 



-^y OULD like to ixcnange a i o m. oujcu , ^ .^ JENN1NG:i) 7b MayoI . block, Chicago, 111. 



WANTED.-One second-hand turntable ; also one second-hand ;9ecUon cu«er for sof t «»»»«£}»» I 



WILL EXCHANGE OBJECTIVE. -An adjustable Nachet 1-9 (dryl-society screw, with very 

 Wgfc workingdistance-has moderate angie. ^re^ene^td. ^ ^^ ^ 



rrO EXCHANGE-Pulvermacher chain battery (100 elements) for applying electricity to thebody 

 T°4o1t C i6\«eap microscope stand, f^^^^^^, Fall Rlvcr , Mass. 



F^cIa^gTToT^^^ 



cash or beautiful diatom material from Bnnpej^wgg^ ^^ simmerlng 14 , Au8trla . 



others, for well 



W lLX u exchange mounted slides of various mineraU Jnatlve gjffiRjfr^ggK; &V7 



gISTOLOGICAL^ndria"thological Slides to exchange for other| oodsll des^ ^^ QMa 



-piRFSH-WATER ALG^nearly all genera, and many beautiful varieties; also Euglena, Astasia, 

 F R e i b .^or good pathological or other interesting slides. Iffipggggg; watertown, N. Y. 



T^OBSALE.-Acopyof Prof. Leidy's great work on the Rhizopods has been left «t JhUofflce for 



■ C sale, Pr ice, sl.M. : — : 



j WILL exchange good histological ^fo^f/^^gf^citntoa ATenue, Albany, H.Y. 



CJISTOLOGICAL SLIDES, very thin and evenly cut, well mounted and well ringed, will be ex- 

 il changed for Pathological o r topological affffi^ ^ Ge rm anHogpJitaLjraU^lpMa L Pa I _ 



pLEASEannounee that I will snpply labels, cards, and other g^f^Rlgg^gg ^ 



^o¥ s lLE.-Slides, double stained, of, ffi?ff L j^ ggj& fee Avenue, Detroit, Mich. 



^^Kp^^ 



price. : — : ■ 



TMPHIPLiuBTPELLUCIDA, or any other test diatom, moantedin the g^ G ^ um jj h » ving 

 A refractive index of 2 . 4, c an be procured from H. M. CHAS E, M.U.. uent\a, in. i. _ 



T WILL SEND a quantity of good diatomaceous ^^^To^fSSoP^iSSS^Cm^L 

 1 ing— in exchange for well mounted slides. JAB. O. li A liltwr, nnugeiwui y 



^THOLOGICAL, Histological, and other well mounted slides will be exchanged for mounted 

 P specimens of interest. Lists f urnishe d^ppli ™™- UbertJ center, Henry County, Ohio. 



