22 JOURNAL OF riiK [January, 



Parasite of Chenalopex ^£;ypticus {\)xc\)a.xcdi by Prof. Simonson, 

 of Zurich) : by E. A. Schultze. 



Heteromeyenia repens, showing the Statosphercs : by i\. D. 

 Balen. 



Cocconeis on Anacharis : by A. D. Balen. 



Stentor ccei'uleus : by A. D. Balen. 



Aspergillus glaucus on Cheese : by B. Braman. 



HYDROGEN PEROXIDE AS A BLEACHING AGENT. 



Mr. Hyatt said: "Knowing that hydrogen peroxide ])OSsesses 

 the property of discharging the color from organic bodies with- 

 out injuring their tissue, I determined to make trial of this agent 

 in preparing insects for examination. The result is highly grat- 

 ifying. The flea which is on the stage of one of the microscopes, 

 was bleached in this way. The heart and all the other internal 

 organs are clearly shown. Each is perfect, and each is in its 

 ])roper place. The exhibition of the respiratory system is par- 

 ticularly fine. In the process of decoloration by liquor potassce, 

 these delicate structures are either partly or quite destroyed." 



ELECTRICAL ILLU.MINATION. 



Mr. Woolman : " The incandescence lamp which I have 

 brought for exhibition, is the Swan lamp. The arc is very small 

 and is, I think, well adapted for the resolution of fine lines, like 

 those of the Pleurosigma angulatum. The lamj) is suspended 

 from the end of a jointed arm attached to an independent sup- 

 port, and is under the complete control of the operator. The 

 electricity is generated by a Grenet battery of two cells, each 

 containing a zinc and a pair of carbons." 



The President requested a free expression of views on the sub- 

 ject of the electric light. 



Mr. C. F. Cox : " The inquiry into the advantages of electri- 

 cal illumination in microscopy is becoming a prominent one, and 

 the impression will naturally arise that this kind of illumination 

 is destined to supersede all others. Two things claim attention 

 and discussion, — the lamp and the light. In the form of the 

 lamp there is room for great variety, and on the merits of each 

 variety opinions may differ. But the chief question is. What is 

 the quality of the light itself, and for what uses is it fittest? Its 

 quality places it between lamp light and direct sunlight, but 



