Chewing coca leaves is a habit which may be compared to the habit of chewing tobacco with the difference that the former is by far less injurious though there are good reasons to believe that it is far from harmless. Dr. Wedell says an habitual coca chewer is known as coquero and is recognized by his haggard look, gloomy and solitary habit, listless inability, and disinclination for any active employment. The same authority states further that the habitual use of coca acts more prejudicially upon Europeans than upon the Indians accustomed to it from their early years. Occasionally it causes a peculiar aberration of intellect, characterized by hallucinations. Chewing coca leaves has never become common among civilized nations. Large quantities of leaves are, however, imported for the purposes of extracting the active principle cocaine, whose effects are very marked. Cocaine causes a feeling of depression, and a marked reduction in the activity of the senses preceded by stimulation. Cocaine solutions are very extensively employed to produce local anæsthesia in minor surgical operations. Dentists employ it very extensively. Its use has several serious drawbacks. Occasionally it produces no effects whatever and again an ordinary medicinal dose has caused fatal poisoning. For these reasons dentists, physicians, and surgeons often hesitate in using it. According to some authorities the poisonous effects are due to a second alkaloid which occurs in the leaves of some varieties of coca. If that is the case, then poisoning may be prevented by excluding these varieties from the market, which is not an easy matter considering that the leaves are collected, dried, and shipped by ignorant natives. It is also known that the active principle is rapidly destroyed, hence the necessity of using fresh leaves. In the course of one year most of the cocaine has undergone a chemical change and the leaves are absolutely worthless. Careless drying also destroys much or all of the cocaine. FOOTNOTE: [1] Cvea on plate, typographical error; Coca correct.--ED. OUR NATIVE WOODS. REST H. METCALF. How many different varieties of wood are there in your own town? If you never have considered this question you will be surprised at the variety, and, I am sure, will enjoy making a collection for yourself. A pretty cabinet size is two inches in length and the same in diameter. This size is very convenient, unless you have an abundance of room, and will show fibre, grain, and color quite distinctly. If you will plane off two sides of the block you will see the grain plainly, and, if possible to polish one side, you will see what a beautiful finish some of our own woods will take.