252 KE VIEWS. 



the grinding operation too far, and just rubbed off the point of the 

 tooth with its aperture, so that the opening now to be seen is 

 merely a shghtly transverse or obhque section of the tube ; 

 however, it displays the structure of the tooth and the full stream 

 of granules by which it is fihed. For obvious reasons I did not 

 attempt grinding the opposite side of the tooth, as this would 

 probably have caused the loss of the granules. On examination 

 by the ^-in. object-glass, it will be found that these lie super- 

 posed, several thicknesses of granules in depth. Somewhat 

 crystalline, they appear less sharply angular than well defined 

 crystals, and not much longer than broad, as in the ordinary 

 oxalic and prismatic crsytals. They look like crystalline stones, 

 and may have become rounded by friction. I enclose the shde 

 for examination. y. P. Balkwill. 



EXPLANATION OF PLATE XXVIIL 



Fig. 1. — Lipeurus Baculus (Pigeon-Louse). 

 2. — Antennitt of ^ . 

 3. — Posterior leg. 

 4. — Antenna3 of ^ , 



5. — Anterior leg. 



After Denny. 







6. — Outline sketch of the Fang of a Viper, x 25. 

 7. — Portion of same, showing crystals of poison, in situ, x 150. 



Drawn by Miss B. Bryant. 



1Rcv(ew6* 



Year-Book of the Scientific and Learned Societies of 

 Great Britain and Ireland, giving an account of their Origin, 

 Constitution, and Working. Compiled from official sources. With 

 Appendix, comprising a list of the Leading Scientific Societies 

 throughout the world. {^London : Chas. Griffin and Co. 1884.) 



We have for years felt the urgent need for such a work as the 

 present. The receipt, therefore, of the first annual issue of this 

 work gives us much pleasure. 



