1886.] 



MICROSCOPICAL JOUENAL. 



193 



tioned above is realgar, arsenic sul- 

 phide, which may be used alone or 

 dissolved in arsenic bromide. 



Dr. Morris, of New South Wales. 

 has used sulphur for mounting and 

 also selenium, the latter having an in- 

 dex of refraction of 3.6. Prof. W. 

 H. Seaman has prepared an excellent 

 medium by dissolving sulphur in an- 

 ilin. 



So great are the advantages of 

 these media that a few persons have 

 been led to believe they in some way 

 increase the resolving power of an 

 objective, and enable one to do as 

 much with a lens of low angular ap- 

 erture as can be done when balsam 

 is used \vith another of greater angle. 

 Obviously this is not true. The dis- 

 tinction between visibility and reso- 

 lution should be clearly drawn. 



EDITORIAL. 



Publisher's Notices.— All communications, ex- 

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Vol. V (1884), Nos. 2-12, ^i.oo. 



Vol. VI (1885), gioo. 



Jottings by the Way. — Our 



sojourn in San Francisco was made 

 very enjoyable by the cordial hospi- 

 tality for which the Western Coast 

 is famous. We first called upon a 

 gentleman well known to our read- 

 ers, Mr. A. H. Breckenfeld, the effi- 

 cient Secretary of the San Francisco 

 Microscopical Societ}' . It was a great 

 pleasure to find such an enthusiastic 

 and active microscojDist, but it was no 



surprise to us, for we were already ac- 

 quainted with some of his work, and 

 were prepared to meet an energetic 

 and well-informed student. Through 

 Mr. Breckenfeld we made the ac- 

 quaintance of other members of the 

 Society, and of the Academy of 

 Sciences, to whom we are indebted 

 for many courtesies. The officers 

 foi'mally tendered us the ' freedom 

 of the rooms' of the Society, which 

 afforded an opportunity to refer to 

 the books in the library, a privilege 

 we made good use of. The Society 

 has a good library of books and pe- 

 riodicals relating to microscopy. It 

 is. indeed, one of the best libraries 

 of the kind we have seen, and as it 

 is always available to members, it 

 affords unusual opportunities for 

 studv. Several microscopes are on 

 the tables, and apparatus for mount- 

 ing is at hand. The cabinet is an 

 exceedingly good one, and includes; 

 in addition to a good general collec- 

 tion of objects, the whole of the late 

 Dr. Edwards' collection of diatoms, 

 mounted specimens, and material. 

 This alone is an exceedingly valu- 

 able collection, which was pur- 

 chased for the Society some time 

 ago. Unfortunately, we were un- 

 able to attend a meeting of the So- 

 ciety, as we hoped to do. A meet- 

 iiig was held on the evening of our 

 departure, of which our readers will 

 doubtless have a report before these 

 lines can possibl}^ be printed. 



The Society is certainly one of the 

 most active and flourishing in the coun- 

 try. The President, Dr. S. M. Mouser, 

 is engaged, in conjunction with Dr. 

 Ferrer, in studying the microbes of 

 disease, having a fine lot of appa- 

 ratus for the purpose recently im- 

 ported from Germany by Dr. Ferrer. 

 The Vice-President", Prof. E. G. 

 Wickson, has charge of the experi- 

 mental grounds of the University of 

 California, where we had the pleasure 

 of spending some time with hini one 

 day to our interest and profit. Mr. 

 C. W. Banks, Corresponding Secre- 

 tary, we were unable to meet, greatly 



