1885.] NEW-.YORK MICROSCOPICAL SOCIETY. 203 



years, and I find rosin preferable to balsam as a medium for 

 mounting them,' 



ILLUMINATION BY AID OF AIR-BUBBLES. 



' For very delicate structures, such as fur-fibres,' continues Mr. 

 Brevoort, ' I often purposely permit air-bubbles in the mounting 

 material, or introduce them into it. The chances are that some 

 of the fibres will pass through some of the air-bubbles, and when 

 they do this in the proper position, the fibres will be found to be 

 illuminated by the reflection of light from the upper part of the 

 concave surface of the bubble, and the surface of the fibres may 

 be studied with a Tsth-inch immersion lens as readily as with a 

 I -inch. This method of illuminating I find of great service with 

 the highest powers. I have used it with balsam and glycerine. 

 With the latter it works exceedingly well. The air-bubbles may 

 best be introduced by means of a stylographic pen-filler.' 



PUBLICATIONS RECEIVED. 



Proceedings of the American Academy of Arts and Sciences : New Sen, 

 Vol. XII., Whole Sen, Vol. XX. (May, 1884, to May, 1885) ; pp. 558. 



Transactions of the Connecticut Academy of Arts and Sciences : Vol. VI., 

 Pt. 2 (18S5); pp. 517. 



The Microscope: Vol. V., No. 8 (August, 1885) ; pp. 24. No. 9 (Septem- 

 ber) ; pp. 24. No. 10 (October) ; pp. 24. 



The American Monthly Microscopical Journal : Vol. VI., No. 8 (August, 

 1885) ; pp. 20. No. 9 (September) ; pp. 20. No. 10 (October) ; pp. 20. 



The Botanical Gazette : Vol. X., No. 8 (August, 1885) ; pp. 16. Nos. g 

 and 10 (September and October) ; pp. 46. 



The Journal of Mycology : Vol. I., No. 8 (August, 1S85) ; pp. 12. No. 9 

 (September); pp. 12. No. 10 (October) ; pp.12. 



The West- American Scientist : Vol. I., No. 8 (July and August, 1885) ; pp. 

 8. No. 9 (September) ; pp. 8. 



Brooklyn Entomological Society. Entomologica Americana : Vol. I., No. 5 

 (August, 1885) ; pp. 20. No. 6 (September) ; pp. 20. No. 7 (October) ; pp. 

 20. 



The Natural History Society of Montreal, Canada. The Canadian Record 

 of Science : Vol. I., No. 3 (1885) ; pp. 64. 



The Journal of the Cincinnati Society of Natural History : Vol. VIII., No. 

 2 (July, 1885) ; pp. 84. No. 3 (October) ; pp. 56. 



Proceedings of the Canadian Institute, Toronto: Third Sen, Vol. III., 

 Fascic. No. 2 (July, 1885) ; pp. 6-j-ioi. 



Drugs and Medicines of North America : Vol. I., No, 6 (June, 1885) ; pp. 

 31- 



