/ 



138 THE MICROSCOPE. Sept. 



tissues rich in coloring, resin and tannic matters ; s, s, stone cells ; m, m, 

 mednllary rays ; cr, crystal cell ; ca, cambium. 



fj^ .9 — Small portion of longitudinal-tangential section of the inner 

 bark of T.mga Cannden-sis, magnified about 75 diameters, a, a, medullary 

 rays, the cells containing much starch ; h, b, stone cells ; c, row of cells con- 

 taining crystals of calcium oxalate ; s, cell containing oleo-resinous secretion. 



jTjfj^ J. — \ few of the crystals magnified 2:30 diametei-s. 



j,^ig^ 4.— Small iwrtion of cross-section of bark of Tsuga Mertcnaiam, mag- 

 nified about .50 diameters, c, c, c, bands of .secondary cork ; a, intervening 

 dead tis.sues composed of sieve and parenchymatous elements, and like the 

 other specie-s, rich in tannic, resinous and coloring matters : s, s, groups of 

 stone cells ; m, m, relatively large, fusiform medullary-ray cells ; &, band of 

 large parenchymatous cells ; cr, crystal cell ; m, cambium cells. 



/r/y. ,5. — Small portion of longitudinal-tangential section of bark of Tmga 

 Mertensiana, magnified about 75 diameters, s, cluster of stone cells ; cr, 

 crystals of ailcium oxalate : ?/i, m, medullary rays ; r, oleo-resin cell. 



A Comparison of American and Foreign Microscopes. 



BvC. H. EVANS, M. D., 



CANTUN, OIITO. 



I have used the microscoije for 25 years, have had 

 American and Foreign, (Frencli, English and German). 

 The cheap French instruments are a delusion and a fraud. 

 The stands made by Bausch and Lomb are very good and 

 so areZentmayer's. Some years ago I bought a Bullock's 

 Professional but did not like it for high power work. 

 The stage rotation was not as true and steady as I ex- 

 pected to find, and the fine adjustment of all the Amer- 

 ican stands moves too rapidly for high powers. I saw the 

 advertisement in the Microscopical Journal of W. Wat- 

 son & Sons, London, with a discription of their Van 

 Heurich stand and was satisfied that if it was what was 

 claimed for it, it was the best stand in the market at any 

 price. So I ordered one. It cost me $135 with a 40 per 

 cent duty added. I have been using it about six months 

 and I can say after an extended trial that I find it as 

 near perfection as it is possible to get. It is really a 

 beautiful stand and I believe is cheap at the price. I 

 am a believer in protection to [American industries and 



