Notes. 69 



Mr.W. H. Bulloch, of Chicago, exhibited several of his stands, 

 which are fast becoming better known and appreciated. 

 Among the rest was his largest stand which is a model of com- 

 pleteness. 



Mr. Joseph Zentmayer was unfortunately not able to attend, 

 and his son, who expected to be present, was also detained at 

 home. Some of their fine stands were shown by Mr. John 

 Sidle, who also represented J. W. Queen & Co., and as usual 

 their beauty in design, and the wonderful mechanical skill, 

 shown by their smooth' movements in every part, made them 

 universally admired. 



Mr. Ed. Bausch, of the Bausch & Lomb Optical Company, 

 had a series of objectives made by them. Several objectives, 

 provided with the new cover adjustment, lately patented by 

 Mr. Grundlach, and, we believe, now belonging solely to this 

 company, were also exhibited for the first time. 



There was much more that deserves mention, but our limited 

 space makes it advisable to close here. 



NOTES. 



— Dr. Thudicum, whose name has long been connected with some val- 

 uable chemical studies on the brain matter, has succeeded in obtaining 

 a peculiar coloring matter from egg shells, the absorption spectrum of 

 which is identical with cruentin. 



— In Germany there has been invented an apparatus which permits 

 sixty microscopic objects to be examined, in succession, without chang- 

 ing slides or readjustment of objective. It is made on the plan of the 

 revolving stereoscopes, and is called a " poly-microscope." 



We know of an English gentleman who has his polariscope so ar- 

 ranged that he can reproduce any effect at pleasure. If we could only 

 observe by machinery, how convenient it would be. 



— H. N. Mosely has lately described his method of imbedding soft tis- 

 sues for cutting sections. His process is a slight modification of one 

 devised by Mihakowics. Equal parts, by weight, of gelatin and glycer- 

 in are heated together, until the former is dissolved. Mosely finds a 

 little excess of glycerin an advantage. The tissues, hardened and 

 stained if necessary, are soaked in glycerin and transferred to the 

 warm mixture until thoroughly penetrated by it. They are then 

 placed in blocks of liver hardened in common alcohol, with sufficient 

 of the imbedding material, properly arranged for cutting, and the whole 

 placed in absolute alcohol. The liver contracts and holds the tissue 



