The Microscope. 63 



17. How make colored varnishes for finishing purposes ? 



Good finishing varnishes are made by adding dry colors to dam- 

 mar varnish or balsam, grinding and filtering. Allen Y. Moore makes 

 a beautiful black of asphalt and of Japan gold-size. 



E. H. Griffith, Fairport, N. Y. 



18. What will make a dead black back-ground for slides? 

 Use the finest and the best ivory-drop black, such as is used by 



carriage- painters. Mix with turpentine. X. 



19. Is an instrument practicable of moderate weight which 



shall carry all really valuable accessories (supra and substage), 



so adapted as to be always ready for immediate use, expenses 



not regarded ? 



P. L. Hatch, Minneapolis, Minn. 



Yes. E. H. Griffith, Fairport, N. Y. 



20. What are some of the most interesting microscopic 

 crystals ? 



The chemical crystals I have found most interesting, and many 

 of which I have prepared, viz.: Salicin, santonin, helicin, asparagin, 

 aspartic acid, bicromate of potash, arsenious acid, cinchonoidin, hip- 

 puric acid, oxalate of ammonia, quinidin, sulphate of cadmium, sul- 

 phate of copper, chloride of copper, platinocynide of magnesium, 

 pyrogallic acid. [All the above selections from the Proceedings of the 

 American Society.] 



One Result of Dr. Dallinger's Visit. — Dr. Anthony said 

 that it gave him great pleasure, after hearing the account which 

 the President had given them, to propose on behalf of the So- 

 ciety that its warmest thanks be given to the American Society 

 of Microscopists for the very cordial, generous, and hospitable 

 reception which they had given to the representatives of the 

 Society on the occasion of their recent visit to the annual meet- 

 ing at Rochester. He had himself fully expected that a depu- 

 tation from this Society would meet with a hearty welcome, 

 and he was sure that all would be glad to hear how thoroughly 

 these anticipations had been realized. It had not unnaturally 

 been regarded as an evidence of very friendly feeling that a 

 Society like theirs should send its representatives to express an 

 interest in what was being done across the water ; long might it 

 be the case that the people who formed that great nation would 

 remember with affection the old country from which they 

 sprang. — Royal Mio. Journal. 



