1930 Journal of Applied Microscopy 



Triple phosphate crystals appear in star shaped ro- 

 settes or characteristic coffin shaped crystals. Calcium 

 phosphate crystals are somewhat similar to uric acid crys- 

 tals, but smaller, more delicate and devoid of color. These 

 crystals indicate an alkaline urine which is abnormal in 

 itself ; quantities indicate a general lowering of vitality. 

 If constantly abundant in freshly voided urine, calculus "^"P'^ Phosphates, 

 should be suspected. 



Leucin and tyrosin are found in the urine, the former 

 in the form of globules which are nearly as brilliant as 

 oil globules. It is insoluble in ether, which differentiates 

 it from oil globules. Tyrosin crystallizes in very fine 

 needle shaped crystals, arranged like sheaves of grain. 

 They may be classed among the rarer sediments. In 

 cases of extensive suppuration, leucin and tyrosin may 

 appear in the urine in large quantities, partially in place 

 They are also found in cases of acute yellow atrophy of the liver and 

 in phosphorous poisoning. William H. Knap. 



Harvey Medical College. 



The Technique of Biological Projection and Anesthesia of 



Animals. 



Cl>PYKI(;HTF.l). 



VI. PROJECTION MICROSCOPES USING ELECTRIC ARC OR OXYHYDRO- 



GEN LIGHT.— Continued. 



This lamp may be used on either incandescent or arc currents, the former 

 usually of 110 volts or less, the latter with a voltage of about liUUU, and on either 

 the direct or alternating currents of either system. A fixed rheostat suited to the 

 current or an adjustable rheostat, which is more convenient, if the lamp is to be 

 used on different currents, is always necessary. A flexible wire cable or heavily 

 insulated copper wire (about No. \'2) is connected with the binding-posts in the 

 base board. One of these cables runs to one pole of the fuse-box of the building 

 or to some other point where it is possible to connect with the heavy feed wires 

 which supply the current. The other cable connects with one binding-post of 

 the rheostat and from the other binding-post of the rheostat another cable con- 

 nects with the other heavy feed wire in the fuse-box or elsewhere, as above 

 described. Do not attempt to take a current from an incandescent light socket. 

 The switch should remain open until all connections have been made, and before 

 closing the switch test the working of the feed-wheels and separate the points of 

 the carbons about a half turn of the wheels. Look through the colored glass 

 window in the door of the lantern body, after the switch is closed, and turn both 

 feed-wheels at the same time until the carbons come into contact and the arc is 

 produced, and then iiistajitly turn the feed-wheels backward about a quarter turn 



