THE society's XOTE-BOOKS. 47 



the palpal organs and the vesiculae seminales, and the presence of 

 vesiculge seminales, in the part usually ascribed to them, is, I 

 think, beyond doubt. 



D. Moore. 



Cuttings Glass-Circles.— I cut my own circles, trough-covers, 

 etc., and find no difficulty in doing so. I use some perforated 

 wooden slips of suitable size, procured at any optician, and run 

 the writing-diamond round the aperture. Any smooth hole will 

 answer, or even a card with a hole punched in it will do, but soon 

 wears rough. The thin glass must be well supported ; a piece of 

 plate-glass is best to rest it on. The diamond should have a 

 turned point, and not a mere splinter. Very little pressure upon 

 the diamond is necessary ; too much will make a rough scratch, 

 when the glass will not break evenly. It is well to leave the cir- 

 cles a day or two before breaking them out of the glass ; they 

 come out much better than if just cut. 



H. E. Freeman. 



Polariscope objects, with few exceptions, are merely pretty 

 things, well enough calculated, in moderation, to relieve the solid 

 bill of fare at a soiree or conversazione, but nothing whatever is to 

 be learnt from them save that by certain arrangements of appara- 

 tus belonging to our microscopes, some things become decked in 

 gay colours ; that is literaUy all. 



TuFFEN West. 



EXPLANATION OF PLATE YIIL 



Fig. 1. — RhyncJiolophus plialangioides (Tromhidinm phalangioides, 



Herm.), from Hermann's figure, copied from " Economic 

 Entomology," and is supposed to be the Acarus phalangioides 

 of Degur, which occurs under the bark of trees in the forest 

 of the Ardennes. The magnification is not given. 

 ,, 2. — Gamasus found with 

 3. — Uropoda vegetans. 



Drawn by A. Hammond. 

 4.— Female of White Mite, x 72. 



5. — Hypopus, found with the White Mites, x 72. 

 6.— Young of White Mite, x 72. 



Drawn by C. F. George, and copied from his article in 



"Science Gossip," Yol. 14. 



3> 



n 



