306 NOTES FROM THE SOCIETY'S NOTE-BOOKS. 



above, have asserted what is no doubt the true state of the case. 

 The so-called single eye is really a chister of ocelli. R. H. Moore. 



Calathus cisteloides.— This beetle is iigured in Rev. J. G. 

 Wood's Common British Beetles and named C. cisteloides., and is 

 described at p. 34 as follows : — 



" The length of this insect is raiher under half-an-inch. It is 

 one of the dull-coloured species, as are indeed almost though not 

 all beetles which live in dark retreats and only venture into the 

 open air at night. It is almost entirely black, but the basal joint 

 of the antennae and the legs are red. Sometimes even the legs 

 partake of the general black hue of the body. 



The disc of the thorax is extremely wrinkled, and there is a 

 large oval impression on either side of the base. If is narrower 

 in front than at the base. The head is very smooth and convex 

 behind, and has a small furrow on either side between the antennae. 

 This is one of the wingless genera, the second or membranous 

 pair of wings being undeveloped." H. W. Lett. 



Coleus, Leaf and Glands. — The red beads on the leaf of Coleus 

 are the essential oil-glands. Similar appendages will be found on 

 the leaves of the common Myrtle, the Mints, Sweet Briar, Euca- 

 lyptus, and Garden Lavender ; all of which yield a perfume more 

 or less readily when bruised or crushed, which ruptures the Uttle 

 vessels and the essential oil escapes. H. W. Lett. 



The slides illustrating the essential-oil glands in the leaves of 

 plants are most interesting. Some species of Citrus have them as 

 fully developed as Hype7iciim perforatum, about which latter plant, 

 by the way, an old legend relates that the minute holes are formed 

 by the devil with his needle. E. E. Jarrett. 



Coal Section. — The slide so marked is incorrectly named, but 

 the error is by no means uncommon, as almost all dealers supply 

 similar sections under the same name. Still, as the substance 

 sectioned is Lignite, the title is partly correct, as it is the coal of 

 the Tertiary period. It contains much more bitumen than our 

 own coal of the carboniferous period, is also much softer, so much 

 so that it can be easily cut with a knife. It has a dull, earthy 

 appearance, and has no "joints" in it. 



