176 The Microscope. 



and coloring matter. The coloring-matter is present in nearly 

 all the cells adjoining the liber fibre and the woody bundles. 

 The starch is found in greatest abundance toward the center of 

 the stem. Oil is found in a few special glands or sacs just inside 

 of the collenchyma. The bundles of liber fibre and also the wood 

 prosenchyma and pitted cells are of a bright yellow color. The 

 phloem is clear white,very thin-walled, and contains protoplasm. 

 In very small inter-cellular, spaces in the outer part of the paren- 

 chyma resin is found. 



Letter References to Figs. 1, 2, 3, 5, 8, 9, 10, and 11.— a, epidermis ; b, paren- 

 chyma; c, endodermis ; d, phloem; e, liber fibre; /, pilted cells; g, medullary rays; 

 h, wood prosenchyma; i, reticulated cells of parenchyma; k, pith parenchyma; I, 

 spiral vessels ; m resin; w, cells filled with yellow coloring matter; o, oil-bearing 

 parenchyma ; p, palisade tissue ; r, cuticle ; s, starch or starch-bearing parenchyma 

 t, root-hairs ; v, chlorophyll-bodies; ,w, stomates. 



HOW TO MOUNT LARGE INSECTS. 



ROBERT GILLO gives his process for mounting beetles and 

 other large insects, in the July number of the Journal of 

 the Postal Microscopical Society. He procures, for instance, a 

 common ground-beatle, perhaps half-an-inch long. This he 

 places in a test-tube and adds Liquor Potassce, full strength. 

 Here it is steeped until the solution becomes darkened, when it 

 is poured off and fresh added. Here it remains for ten days or 

 two weeks, when the insect is carefully transferred to a dish 

 filled with distilled water. With one camel's-hair brush the in- 

 sect is held steady, while with another brush, the body is pressed 

 upon with a kind of rolling motion, until the contents of the 

 abdomen are driven out. The insect is now transferred to clean 

 water, and left for an hour or so, when the squeezing process 

 with the brushes is repeated. By repeating this process, the 

 whole of the contents of the viscera can be removed without 

 the least injury to any of the internal organs. 



The insect is still opaque. It is, therefore, necessary to 

 bleach it. Eor this purpose it is placed in the following solu- 

 tion, until sufficiently transparent, perhaps a week or more : 

 Make a saturated solution of chlorate of potash, and add 10 to 

 20 drops, or more, of hydrochloric acid to each ounce of solution. 



