42 THE MICROSCOPE. 



weak croton oil — croton oil mixed with glycerine. It is 

 said that under the microscope this artificial product does not 

 vary from the epithelioma in man. He also produced sarcoma 

 in the bones of dogs by fracturing them and keeping up irritation 

 by motion. — Ex. 



To Mount in Glycerine. — Heat India-rubber till it becomes 

 sticky, dissolve it in benzol, ring both cover and slide, then let it re- 

 main till tacky; arrange the object in glycerine, press down the 

 cover, wash away spare glycerine, and run asphalte varnish or other 

 finish. "The advantages are, the India-rubber sticks in spite of the 

 glycerine, and is elastic, and so a great amount of trouble is saved." 

 — J our n. Post. Mic. Soc. 



To Mount Plants in Glycerine and Water. — Add to the 

 glycerine a few drops of carbolic acid to guard against fungoid 

 growth — mix with equal parts of water — don't cement the cover-glass 

 down, but let the water evaporate, and add more glycerine and water 

 until the plant gets gradually filled with glycerine. Fasten the 

 cover-glass by first ringing it with gelatine, to which any cement 

 will adhere. — Journ. Post. Mic. Soc. 



Mr. James Smith said that, in working with high powers under 

 the binocular, he had always found it of great advantage to use a 

 finely-ground glass slip under the slide on which the object was 

 mounted. If a 1-4-th in. or a i-8th in. were used under ordinary cir- 

 cumstances, the black division across the field was seen, but the 

 ground glass seemed to obliterate this entirely. He generally used 

 a piece of very pale blue glass, ground on the upper surface. — Royal 

 Mic. Soc. Proc. 



Mr. Beck says we are only as yet in the infancy of the binocular 

 microscope, and he looked forward to the time when much more 

 attention would be paid to its construction, and particularly to the 

 question of ascertaining the best point at which the prism should be 

 placed to get the full field without adventitious aid in the way of 

 illuminators, by which improved results would no doubt be obtained. 

 He believed that the binocular was the microscope which would be 

 used in the future. — Ex. 



Fatty Bodies as Generators of Bacteria. — T. Brisson de 

 Lenharee points out that fatty substances on mineral bodies or used 



