and Laboratory Methods. -549 



boxes at '25 gm., are now exported every year to Caucasia, Persia and Turke- 

 stan, at a price of about 60 to 80 cents a box. 



The government has this year started a competition in the silk business, 

 awarding prizes in the form of microscopes or cash amouhts, for proficiency in 

 (1) Egg-production, (2) Coccoons, (3) Nurseries, (4) Plantations. Nine chief 

 centers are selected, and in a cycle of three years three places will be visited 

 every year by special officers and about $660 will be distributed at each place 

 in prizes. 



The microscopes in use in the whole business are mostly from Nachet & 

 Fils, Paris, or from F. Koristka, Milan. The magnifying power generally used 

 is 500 to 700 diameters. 



I need dwell no longer on the great benefit accruing to this country from a 

 single discovery. May there be many other similar discoveries made by the 

 bright minds all the world over. T. J. Mantssadjam. 



Anatolia Colleee; Merzifun ( Marsovan), Turkey in Asia. 



A Simple Thermometer Attachment for the Copper Plate 



Warm Stage. 



A copper plate with a projecting arm heated by an alcohol lamp or a gas 

 burner is well known as a rough and ready warm stage for the microscope, but 

 the following simple thermometer attachment to such a stage is, so far as I am 

 aware, new and furnishes a means of determining and regulating the temperature. 

 This attachment consists, as the accompanying figure shows, of a sleeve (s) for 

 receiving an ordinary chemical thermometer (T), formed from an edge of the stage 

 part of the plate (a) bent into a tube. A warm stage with this attachment can 

 be constructed very easily from a piece of sheet copper. The side of the stage 



T 



to form the thermometer sleeve should be cut a trifle more than three times the 

 diameter of the thermometer longer than the opposite side. This projecting 

 side is then rolled up into a tube. 



The thermometer attached in the position shown in the figure balances the 

 arm (c) to which the heat is applied, and is in a position convenient to be read. 

 The bulb of the thermometer being at approximately the same distance from the 

 source of heat as the center of the stage and entirely surrounded by the copper 

 plate, the temperature registered will conform closely to that of the center of the 

 stage. Ernest Linwood Walker. 



Massachusetts .State Board of Health. 



