21R THE A-MKinCAN MONTHLY [Aug., 



use cliK'k «)il. Never take lioUl i»f the tube to move it, always 

 j:nu<p the arm. If out of repair send (Hrectly to the manufaiturer 

 or to a phiee wliere such work is specially done. Do not let any 

 one work upon it who knows notliini:; about such work. Keep 

 your objectives from direct sunlij;ht and sudden or extreini! 

 chanjie of temperature. Have plenty of old, white linen ready 

 for cleanin;^ and wiping slides, lenses, etc. Keep it in a dust- 

 proof Itox and near at hand. 



Make drawinjjs of every thinj; not pennanently mounted. 

 I'se the camera luci«la, and if you arc clever with colors, color 

 them, using water colors. Take notes of everything examined. 

 Let the notes accompany the drawing. Get a plain unruled 

 hook for the purpose. Get a dr:;wing hook if you can. Some 

 use very fine pointed or very hard ]iencils for the drawings and 

 trace with ink afterwards. 



Take a micn)SCopical journal — two or three, if you can afford 

 it. Also get books. I will name a few from which I have 

 derived much good. If you are a beginner, by all means get 

 Microscopy for Amateurs by T. C. White; ^Lmipulation 

 of the Microscope by Bausch; How to use a Microscope by 

 I'hin ; On Mounting Microscopic objects, by Davies. These 

 can be had from the Microscopical Publishing Comi)any, 

 Washington, D. C. There is a small journal that every one 

 can take. It costs only, 81,00 per year — The Microscope. 

 The American Monthly Microscopical Journal is highly recomen- 

 ded and is within reach of nearly all. Address Microscopical 

 Publishing Company, Washington, D. C. Send lo all those who 

 advertise in these periodicals for catalogues. Many hints can 

 be had from them, and the advantages of clearance sales. 



Flower Crystals of Sugar. — Prepare two test tubes of sat- 

 urated solution of sugar; one of alcohol, the other of water. 

 Then mix the two solutions in a third test-tube, and when 

 throughly mixed, place a drop in the center of a slide and let it 

 rest until it becomes a hard homogeneous mass. Then set this 

 slide, thus i)repared, on the top of a .student's lami) shade. In 

 the course of a short time, the flower crystals begin to develope. 

 I^ave the slide in that position until crystals hav* developed 

 over the whole mass. The crystals are now very hard and jier- 

 manentand maybe mounted. View it with the polariscope. 



